21021576 ÷ 129 
We're looking to find how many times 129 goes into 21021576.

On to step 1:
The number 129 fits into 2 0 times, leaving a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 129

Step 2:
The number 129 fits into 21 0 times, leaving a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 21 to get 21.
Grab the next digit (0) from the dividend, add it to 21, then carry on: 210 / 129

Advancing to step 3:
129 goes into 210 1 times with a remainder of 81.
The next digit of our result is 1. 
Result so far: 1.0
If we subtract 129 from 210, we get 81.
Grab the next digit (2) from the dividend, add it to 81, then carry on: 812 / 129

On to step 4:
129 can be fit into 812 6 times, resulting in a remainder of 38.
The next digit of our result is 6. 
Result so far: 16.0
The remainder is 38 after subtracting 774 from 812.
Grab the next digit (1) from the dividend, add it to 38, then carry on: 381 / 129

Step 5:
129 goes into 381 2 times with a remainder of 123.
Use 2 as the next digit of our solution. 
Result so far: 162.0
Subtracting 258 from 381 leaves us with 123.
Fetch the next digit (5) from the dividend, attach it to 123 and continue: 1235 / 129

Let's proceed to step 6:
129 can be fit into 1235 9 times, resulting in a remainder of 74.
Record the quotient 9 as the next digit in the result. 
Result so far: 1629.0
If we subtract 1161 from 1235, we get 74.
Include the next digit (7) from the dividend after 74, then repeat: 747 / 129

On to step 7:
The number 129 fits into 747 5 times, leaving a remainder of 102.
Record the quotient 5 as the next digit in the result. 
Result so far: 16295.0
Subtract 645 from 747 to get 102.
Take the next digit (6) from the dividend and append it to 102, then repeat: 1026 / 129

Let's proceed to step 8:
When dividing 1026 by 129, we get 7 with a remainder of 123.
The next digit of our result is 7. 
Result so far: 162957.0
The remainder is 123 after subtracting 903 from 1026.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1230, and continue the process.

Going ahead to step 9:
The number 129 fits into 1230 9 times, leaving a remainder of 69.
Use 9 as the next digit of our solution. 
Result so far: 162957.9
If we take 1161 away from 1230, we end up with 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Let's proceed to step 10:
The number 129 fits into 690 5 times, leaving a remainder of 45.
Use 5 as the next digit of our solution. 
Result so far: 162957.95
Deduct 645 from 690 and we're left with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Moving on to step 11:
129 can be fit into 450 3 times, resulting in a remainder of 63.
Put 3 as the next digit of the answer. 
Result so far: 162957.953
Subtract 387 from 450 to get 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Advancing to step 12:
129 goes into 630 4 times with a remainder of 114.
Write down 4 as next digit of the result. 
Result so far: 162957.9534
If we subtract 516 from 630, we get 114.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1140, and continue the process.

On to step 13:
1140 divided by 129 is 8 with a remainder of 108.
Use 8 as the next digit of our solution. 
Result so far: 162957.95348
Subtracting 1032 from 1140 leaves us with 108.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1080, and continue the process.

Let's proceed to step 14:
1080 divided by 129 is 8 with a remainder of 48.
The number 8 becomes the next digit in our result. 
Result so far: 162957.953488
The remainder is 48 after subtracting 1032 from 1080.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

The quotient of the division is 162957.953488, and the remainder is 4.8e-06.