We look at the division of 21369197 by 159 
We want to divide 21369197 by 159.

Advancing to step 1:
If we divide 2 by 159, we get 0 and a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 159

Advancing to step 2:
21 divided by 159 is 0 with a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 21 to get 21.
Append the next digit (3) from the dividend to 21 and continue with: 213 / 159

Step 3:
If we divide 213 by 159, we get 1 and a remainder of 54.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we take 159 away from 213, we end up with 54.
Append the next digit (6) from the dividend to 54 and continue with: 546 / 159

On to step 4:
546 divided by 159 is 3 with a remainder of 69.
The number 3 becomes the next digit in our result. 
Result so far: 13.0
If we subtract 477 from 546, we get 69.
Grab the next digit (9) from the dividend, add it to 69, then carry on: 699 / 159

Going ahead to step 5:
159 goes into 699 4 times with a remainder of 63.
The number 4 becomes the next digit in our result. 
Result so far: 134.0
Subtracting 636 from 699 leaves us with 63.
Bring next digit (1) of the dividend behind the 63 and repeat the process: 631 / 159

Moving on to step 6:
159 goes into 631 3 times with a remainder of 154.
Record the quotient 3 as the next digit in the result. 
Result so far: 1343.0
Deduct 477 from 631 and we're left with 154.
Grab the next digit (9) from the dividend, add it to 154, then carry on: 1549 / 159

On to step 7:
When dividing 1549 by 159, we get 9 with a remainder of 118.
Write down 9 as next digit of the result. 
Result so far: 13439.0
Subtracting 1431 from 1549 leaves us with 118.
Grab the next digit (7) from the dividend, add it to 118, then carry on: 1187 / 159

Let's proceed to step 8:
159 goes into 1187 7 times with a remainder of 74.
The number 7 becomes the next digit in our result. 
Result so far: 134397.0
If we subtract 1113 from 1187, we get 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

On to step 9:
The number 159 fits into 740 4 times, leaving a remainder of 104.
Write down 4 as next digit of the result. 
Result so far: 134397.4
Subtracting 636 from 740 leaves us with 104.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1040, and continue the process.

Step 10:
159 goes into 1040 6 times with a remainder of 86.
Write down 6 as next digit of the result. 
Result so far: 134397.46
If we take 954 away from 1040, we end up with 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Moving on to step 11:
159 can be fit into 860 5 times, resulting in a remainder of 65.
Record the quotient 5 as the next digit in the result. 
Result so far: 134397.465
Subtract 795 from 860 to get 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

On to step 12:
159 can be fit into 650 4 times, resulting in a remainder of 14.
The number 4 becomes the next digit in our result. 
Result so far: 134397.4654
Deduct 636 from 650 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Moving on to step 13:
159 goes into 140 0 times with a remainder of 140.
Record the quotient 0 as the next digit in the result. 
Result so far: 134397.4654
Subtracting 0 from 140 leaves us with 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Step 14:
159 goes into 1400 8 times with a remainder of 128.
Put 8 as the next digit of the answer. 
Result so far: 134397.465408
If we subtract 1272 from 1400, we get 128.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1280, and continue the process.

Step 15:
159 goes into 1280 8 times with a remainder of 8.
Write down 8 as next digit of the result. 
Result so far: 134397.4654088
Subtract 1272 from 1280 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

After the division, we end up with 134397.4654088 and a remainder of 8e-08.