We divide 21351571 by 679
Our goal is to divide 21351571 by 679.

Advancing to step 1:
2 divided by 679 is 0 with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 679

Going ahead to step 2:
21 divided by 679 is 0 with a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 21 and we're left with 21.
Append the next digit (3) from the dividend to 21 and continue with: 213 / 679

Let's proceed to step 3:
213 divided by 679 is 0 with a remainder of 213.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 213 to get 213.
Grab the next digit (5) from the dividend, add it to 213, then carry on: 2135 / 679

Moving on to step 4:
679 can be fit into 2135 3 times, resulting in a remainder of 98.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
If we subtract 2037 from 2135, we get 98.
Append the next digit (1) from the dividend to 98 and continue with: 981 / 679

Advancing to step 5:
679 can be fit into 981 1 times, resulting in a remainder of 302.
The number 1 becomes the next digit in our result. 
Result so far: 31.0
The remainder is 302 after subtracting 679 from 981.
Bring next digit (5) of the dividend behind the 302 and repeat the process: 3025 / 679

Moving on to step 6:
679 can be fit into 3025 4 times, resulting in a remainder of 309.
The next digit of our result is 4. 
Result so far: 314.0
If we take 2716 away from 3025, we end up with 309.
Append the next digit (7) from the dividend to 309 and continue with: 3097 / 679

Step 7:
679 can be fit into 3097 4 times, resulting in a remainder of 381.
The number 4 becomes the next digit in our result. 
Result so far: 3144.0
Deduct 2716 from 3097 and we're left with 381.
Grab the next digit (1) from the dividend, add it to 381, then carry on: 3811 / 679

On to step 8:
When dividing 3811 by 679, we get 5 with a remainder of 416.
The number 5 becomes the next digit in our result. 
Result so far: 31445.0
Subtracting 3395 from 3811 leaves us with 416.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4160, and continue the process.

On to step 9:
The number 679 fits into 4160 6 times, leaving a remainder of 86.
Put 6 as the next digit of the answer. 
Result so far: 31445.6
If we subtract 4074 from 4160, we get 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Advancing to step 10:
The number 679 fits into 860 1 times, leaving a remainder of 181.
The next digit of our result is 1. 
Result so far: 31445.61
If we take 679 away from 860, we end up with 181.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1810, and continue the process.

Step 11:
679 can be fit into 1810 2 times, resulting in a remainder of 452.
The number 2 becomes the next digit in our result. 
Result so far: 31445.612
Subtract 1358 from 1810 to get 452.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4520, and continue the process.

Advancing to step 12:
If we divide 4520 by 679, we get 6 and a remainder of 446.
The number 6 becomes the next digit in our result. 
Result so far: 31445.6126
Subtract 4074 from 4520 to get 446.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4460, and continue the process.

On to step 13:
If we divide 4460 by 679, we get 6 and a remainder of 386.
Use 6 as the next digit of our solution. 
Result so far: 31445.61266
Subtracting 4074 from 4460 leaves us with 386.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3860, and continue the process.

The final outcome is 31445.61266, with a leftover of 0.000386.