We're dividing 21570442 by 13 
Our goal is to divide 21570442 by 13.

Step 1:
2 divided by 13 is 0 with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 13

Let's proceed to step 2:
When dividing 21 by 13, we get 1 with a remainder of 8.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 13 from 21 to get 8.
Grab the next digit (5) from the dividend, add it to 8, then carry on: 85 / 13

Advancing to step 3:
When dividing 85 by 13, we get 6 with a remainder of 7.
Use 6 as the next digit of our solution. 
Result so far: 16.0
Deduct 78 from 85 and we're left with 7.
Fetch the next digit (7) from the dividend, attach it to 7 and continue: 77 / 13

Let's proceed to step 4:
77 divided by 13 is 5 with a remainder of 12.
Record the quotient 5 as the next digit in the result. 
Result so far: 165.0
If we take 65 away from 77, we end up with 12.
Take the next digit (0) from the dividend and append it to 12, then repeat: 120 / 13

On to step 5:
13 can be fit into 120 9 times, resulting in a remainder of 3.
Put 9 as the next digit of the answer. 
Result so far: 1659.0
The remainder is 3 after subtracting 117 from 120.
Take the next digit (4) from the dividend and append it to 3, then repeat: 34 / 13

Moving on to step 6:
The number 13 fits into 34 2 times, leaving a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 16592.0
Subtract 26 from 34 to get 8.
Append the next digit (4) from the dividend to 8 and continue with: 84 / 13

Moving on to step 7:
13 goes into 84 6 times with a remainder of 6.
The number 6 becomes the next digit in our result. 
Result so far: 165926.0
Deduct 78 from 84 and we're left with 6.
Append the next digit (2) from the dividend to 6 and continue with: 62 / 13

Step 8:
When dividing 62 by 13, we get 4 with a remainder of 10.
Write down 4 as next digit of the result. 
Result so far: 1659264.0
If we take 52 away from 62, we end up 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.

Moving on to step 9:
13 can be fit into 100 7 times, resulting in a remainder of 9.
The next digit of our result is 7. 
Result so far: 1659264.7
The remainder is 9 after subtracting 91 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Advancing to step 10:
13 goes into 90 6 times with a remainder of 12.
Record the quotient 6 as the next digit in the result. 
Result so far: 1659264.76
If we take 78 away from 90, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 11:
13 can be fit into 120 9 times, resulting in a remainder of 3.
Record the quotient 9 as the next digit in the result. 
Result so far: 1659264.769
If we take 117 away from 120, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Advancing to step 12:
13 goes into 30 2 times with a remainder of 4.
Record the quotient 2 as the next digit in the result. 
Result so far: 1659264.7692
If we subtract 26 from 30, we 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.

Going ahead to step 13:
13 can be fit into 40 3 times, resulting in a remainder of 1.
The next digit of our result is 3. 
Result so far: 1659264.76923
Subtract 39 from 40 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 13 fits into 10 0 times, leaving a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 1659264.76923
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.

Advancing to step 15:
100 divided by 13 is 7 with a remainder of 9.
The number 7 becomes the next digit in our result. 
Result so far: 1659264.7692307
Subtracting 91 from 100 leaves us with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Advancing to step 16:
13 can be fit into 90 6 times, resulting in a remainder of 12.
Put 6 as the next digit of the answer. 
Result so far: 1659264.76923076
The remainder is 12 after subtracting 78 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

The final outcome is 1659264.76923076, with a leftover of 1.2e-08.