21587959 ÷ 158 
We're looking to find how many times 158 goes into 21587959.

On to step 1:
When dividing 2 by 158, we get 0 with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 158

Let's proceed to step 2:
If we divide 21 by 158, we get 0 and a remainder of 21.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 21 leaves us with 21.
Include the next digit (5) from the dividend after 21, then repeat: 215 / 158

Going ahead to step 3:
158 can be fit into 215 1 times, resulting in a remainder of 57.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 158 away from 215, we end up with 57.
Bring next digit (8) of the dividend behind the 57 and repeat the process: 578 / 158

Moving on to step 4:
The number 158 fits into 578 3 times, leaving a remainder of 104.
Write down 3 as next digit of the result. 
Result so far: 13.0
Deduct 474 from 578 and we're left with 104.
Append the next digit (7) from the dividend to 104 and continue with: 1047 / 158

On to step 5:
158 can be fit into 1047 6 times, resulting in a remainder of 99.
Record the quotient 6 as the next digit in the result. 
Result so far: 136.0
Subtract 948 from 1047 to get 99.
Include the next digit (9) from the dividend after 99, then repeat: 999 / 158

Moving on to step 6:
158 goes into 999 6 times with a remainder of 51.
Use 6 as the next digit of our solution. 
Result so far: 1366.0
Deduct 948 from 999 and we're left with 51.
Include the next digit (5) from the dividend after 51, then repeat: 515 / 158

Let's proceed to step 7:
158 can be fit into 515 3 times, resulting in a remainder of 41.
Put 3 as the next digit of the answer. 
Result so far: 13663.0
Subtract 474 from 515 to get 41.
Bring next digit (9) of the dividend behind the 41 and repeat the process: 419 / 158

On to step 8:
If we divide 419 by 158, we get 2 and a remainder of 103.
Record the quotient 2 as the next digit in the result. 
Result so far: 136632.0
The remainder is 103 after subtracting 316 from 419.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1030, and continue the process.

Let's proceed to step 9:
1030 divided by 158 is 6 with a remainder of 82.
Record the quotient 6 as the next digit in the result. 
Result so far: 136632.6
Deduct 948 from 1030 and we're left with 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Advancing to step 10:
If we divide 820 by 158, we get 5 and a remainder of 30.
Write down 5 as next digit of the result. 
Result so far: 136632.65
If we take 790 away from 820, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

On to step 11:
300 divided by 158 is 1 with a remainder of 142.
Put 1 as the next digit of the answer. 
Result so far: 136632.651
Subtracting 158 from 300 leaves us with 142.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1420, and continue the process.

Going ahead to step 12:
When dividing 1420 by 158, we get 8 with a remainder of 156.
Write down 8 as next digit of the result. 
Result so far: 136632.6518
Subtracting 1264 from 1420 leaves us with 156.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1560, and continue the process.

Step 13:
158 goes into 1560 9 times with a remainder of 138.
Use 9 as the next digit of our solution. 
Result so far: 136632.65189
If we subtract 1422 from 1560, we get 138.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1380, and continue the process.

Step 14:
The number 158 fits into 1380 8 times, leaving a remainder of 116.
The next digit of our result is 8. 
Result so far: 136632.651898
Subtract 1264 from 1380 to get 116.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1160, and continue the process.

Moving on to step 15:
When dividing 1160 by 158, we get 7 with a remainder of 54.
The number 7 becomes the next digit in our result. 
Result so far: 136632.6518987
The remainder is 54 after subtracting 1106 from 1160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Advancing to step 16:
540 divided by 158 is 3 with a remainder of 66.
The next digit of our result is 3. 
Result so far: 136632.65189873
If we subtract 474 from 540, we get 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Our division results in 136632.65189873 with a remaining 6.6e-08.