We look at the division of 21693082 by 858 
We want to figure out the number of times 21693082 can be divided by 858.

Step 1:
When dividing 2 by 858, we get 0 with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 858

Moving on to step 2:
The number 858 fits into 21 0 times, leaving a remainder of 21.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 21 and we're left with 21.
Grab the next digit (6) from the dividend, add it to 21, then carry on: 216 / 858

Advancing to step 3:
858 can be fit into 216 0 times, resulting in a remainder of 216.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 216 after subtracting 0 from 216.
Take the next digit (9) from the dividend and append it to 216, then repeat: 2169 / 858

Moving on to step 4:
858 can be fit into 2169 2 times, resulting in a remainder of 453.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we take 1716 away from 2169, we end up with 453.
Bring next digit (3) of the dividend behind the 453 and repeat the process: 4533 / 858

Let's proceed to step 5:
858 can be fit into 4533 5 times, resulting in a remainder of 243.
Put 5 as the next digit of the answer. 
Result so far: 25.0
Subtract 4290 from 4533 to get 243.
Append the next digit (0) from the dividend to 243 and continue with: 2430 / 858

Let's proceed to step 6:
2430 divided by 858 is 2 with a remainder of 714.
Record the quotient 2 as the next digit in the result. 
Result so far: 252.0
Deduct 1716 from 2430 and we're left with 714.
Bring next digit (8) of the dividend behind the 714 and repeat the process: 7148 / 858

On to step 7:
858 goes into 7148 8 times with a remainder of 284.
Record the quotient 8 as the next digit in the result. 
Result so far: 2528.0
The remainder is 284 after subtracting 6864 from 7148.
Include the next digit (2) from the dividend after 284, then repeat: 2842 / 858

Moving on to step 8:
858 goes into 2842 3 times with a remainder of 268.
Write down 3 as next digit of the result. 
Result so far: 25283.0
If we subtract 2574 from 2842, we get 268.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2680, and continue the process.

Going ahead to step 9:
858 goes into 2680 3 times with a remainder of 106.
Write down 3 as next digit of the result. 
Result so far: 25283.3
Subtract 2574 from 2680 to get 106.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1060, and continue the process.

Moving on to step 10:
If we divide 1060 by 858, we get 1 and a remainder of 202.
The next digit of our result is 1. 
Result so far: 25283.31
Subtracting 858 from 1060 leaves us with 202.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2020, and continue the process.

Moving on to step 11:
2020 divided by 858 is 2 with a remainder of 304.
Record the quotient 2 as the next digit in the result. 
Result so far: 25283.312
Subtracting 1716 from 2020 leaves us with 304.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3040, and continue the process.

Let's proceed to step 12:
The number 858 fits into 3040 3 times, leaving a remainder of 466.
Record the quotient 3 as the next digit in the result. 
Result so far: 25283.3123
Subtract 2574 from 3040 to get 466.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4660, and continue the process.

Let's proceed to step 13:
858 can be fit into 4660 5 times, resulting in a remainder of 370.
Use 5 as the next digit of our solution. 
Result so far: 25283.31235
If we subtract 4290 from 4660, we get 370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3700, and continue the process.

Step 14:
858 goes into 3700 4 times with a remainder of 268.
The number 4 becomes the next digit in our result. 
Result so far: 25283.312354
If we subtract 3432 from 3700, we get 268.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2680, and continue the process.

Advancing to step 15:
If we divide 2680 by 858, we get 3 and a remainder of 106.
The next digit of our result is 3. 
Result so far: 25283.3123543
The remainder is 106 after subtracting 2574 from 2680.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1060, and continue the process.

Advancing to step 16:
When dividing 1060 by 858, we get 1 with a remainder of 202.
Record the quotient 1 as the next digit in the result. 
Result so far: 25283.31235431
The remainder is 202 after subtracting 858 from 1060.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2020, and continue the process.

The final outcome is 25283.31235431, with a leftover of 2.02e-07.