21639560 ÷ 159 
We want to figure out the number of times 21639560 can be divided by 159.

Step 1:
2 divided by 159 is 0 with 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.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 159

Moving on to step 2:
159 goes into 21 0 times with a remainder of 21.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 21 to get 21.
Grab the next digit (6) from the dividend, add it to 21, then carry on: 216 / 159

Going ahead to step 3:
216 divided by 159 is 1 with a remainder of 57.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 159 from 216 and we're left with 57.
Bring next digit (3) of the dividend behind the 57 and repeat the process: 573 / 159

Let's proceed to step 4:
159 can be fit into 573 3 times, resulting in a remainder of 96.
Write down 3 as next digit of the result. 
Result so far: 13.0
If we subtract 477 from 573, we get 96.
Append the next digit (9) from the dividend to 96 and continue with: 969 / 159

Moving on to step 5:
When dividing 969 by 159, we get 6 with a remainder of 15.
Write down 6 as next digit of the result. 
Result so far: 136.0
If we subtract 954 from 969, we get 15.
Include the next digit (5) from the dividend after 15, then repeat: 155 / 159

Step 6:
If we divide 155 by 159, we get 0 and a remainder of 155.
Use 0 as the next digit of our solution. 
Result so far: 1360.0
If we take 0 away from 155, we end up with 155.
Bring next digit (6) of the dividend behind the 155 and repeat the process: 1556 / 159

On to step 7:
159 can be fit into 1556 9 times, resulting in a remainder of 125.
Record the quotient 9 as the next digit in the result. 
Result so far: 13609.0
If we take 1431 away from 1556, we end up with 125.
Fetch the next digit (0) from the dividend, attach it to 125 and continue: 1250 / 159

Let's proceed to step 8:
The number 159 fits into 1250 7 times, leaving a remainder of 137.
Record the quotient 7 as the next digit in the result. 
Result so far: 136097.0
The remainder is 137 after subtracting 1113 from 1250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1370, and continue the process.

Step 9:
When dividing 1370 by 159, we get 8 with a remainder of 98.
The next digit of our result is 8. 
Result so far: 136097.8
Subtracting 1272 from 1370 leaves us with 98.
Since there are no more digits in the dividend, we add a zero to the remainder making it 980, and continue the process.

Going ahead to step 10:
If we divide 980 by 159, we get 6 and a remainder of 26.
The number 6 becomes the next digit in our result. 
Result so far: 136097.86
Subtract 954 from 980 to get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Moving on to step 11:
If we divide 260 by 159, we get 1 and a remainder of 101.
Record the quotient 1 as the next digit in the result. 
Result so far: 136097.861
The remainder is 101 after subtracting 159 from 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1010, and continue the process.

Moving on to step 12:
If we divide 1010 by 159, we get 6 and a remainder of 56.
Use 6 as the next digit of our solution. 
Result so far: 136097.8616
Subtracting 954 from 1010 leaves us with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Advancing to step 13:
159 can be fit into 560 3 times, resulting in a remainder of 83.
Record the quotient 3 as the next digit in the result. 
Result so far: 136097.86163
If we subtract 477 from 560, we get 83.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

Step 14:
159 can be fit into 830 5 times, resulting in a remainder of 35.
Write down 5 as next digit of the result. 
Result so far: 136097.861635
Subtracting 795 from 830 leaves us with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Advancing to step 15:
350 divided by 159 is 2 with a remainder of 32.
Record the quotient 2 as the next digit in the result. 
Result so far: 136097.8616352
If we take 318 away from 350, we end up with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Moving on to step 16:
159 goes into 320 2 times with a remainder of 2.
Put 2 as the next digit of the answer. 
Result so far: 136097.86163522
Subtracting 318 from 320 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

The final result is 136097.86163522 with a remainder of 2e-09.