858268 ÷ 21 
Let's see how many times 21 fits into 858268.

Moving on to step 1:
21 can be fit into 8 0 times, resulting in a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Append the next digit (5) from the dividend to 8 and continue with: 85 / 21

Step 2:
When dividing 85 by 21, we get 4 with a remainder of 1.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Deduct 84 from 85 and we're left with 1.
Fetch the next digit (8) from the dividend, attach it to 1 and continue: 18 / 21

Let's proceed to step 3:
21 can be fit into 18 0 times, resulting in a remainder of 18.
Write down 0 as next digit of the result. 
Result so far: 40.0
Subtract 0 from 18 to get 18.
Take the next digit (2) from the dividend and append it to 18, then repeat: 182 / 21

Advancing to step 4:
21 can be fit into 182 8 times, resulting in a remainder of 14.
Record the quotient 8 as the next digit in the result. 
Result so far: 408.0
Deduct 168 from 182 and we're left with 14.
Grab the next digit (6) from the dividend, add it to 14, then carry on: 146 / 21

Moving on to step 5:
146 divided by 21 is 6 with a remainder of 20.
Use 6 as the next digit of our solution. 
Result so far: 4086.0
If we take 126 away from 146, we end up with 20.
Include the next digit (8) from the dividend after 20, then repeat: 208 / 21

Step 6:
If we divide 208 by 21, we get 9 and a remainder of 19.
Record the quotient 9 as the next digit in the result. 
Result so far: 40869.0
If we subtract 189 from 208, we get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

On to step 7:
When dividing 190 by 21, we get 9 with a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 40869.9
Subtract 189 from 190 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 8:
10 divided by 21 is 0 with a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 40869.9
Deduct 0 from 10 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 9:
If we divide 100 by 21, we get 4 and a remainder of 16.
The next digit of our result is 4. 
Result so far: 40869.904
The remainder is 16 after subtracting 84 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 10:
21 can be fit into 160 7 times, resulting in a remainder of 13.
Put 7 as the next digit of the answer. 
Result so far: 40869.9047
If we subtract 147 from 160, we get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Step 11:
21 can be fit into 130 6 times, resulting in a remainder of 4.
Put 6 as the next digit of the answer. 
Result so far: 40869.90476
Subtract 126 from 130 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 12:
The number 21 fits into 40 1 times, leaving a remainder of 19.
Write down 1 as next digit of the result. 
Result so far: 40869.904761
The remainder is 19 after subtracting 21 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Step 13:
The number 21 fits into 190 9 times, leaving a remainder of 1.
The next digit of our result is 9. 
Result so far: 40869.9047619
Subtract 189 from 190 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 14:
The number 21 fits into 10 0 times, leaving a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 40869.9047619
If we subtract 0 from 10, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

In conclusion, the division gives 40869.9047619 with a balance of 1e-08.