21127909 divided by 129 
Our goal is to divide 21127909 by 129.

Moving on to step 1:
The number 129 fits into 2 0 times, leaving a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 129

Let's proceed to step 2:
21 divided by 129 is 0 with a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 21 leaves us with 21.
Append the next digit (1) from the dividend to 21 and continue with: 211 / 129

Step 3:
211 divided by 129 is 1 with a remainder of 82.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 129 from 211 and we're left with 82.
Fetch the next digit (2) from the dividend, attach it to 82 and continue: 822 / 129

Step 4:
129 goes into 822 6 times with a remainder of 48.
The number 6 becomes the next digit in our result. 
Result so far: 16.0
If we take 774 away from 822, we end up with 48.
Grab the next digit (7) from the dividend, add it to 48, then carry on: 487 / 129

Moving on to step 5:
The number 129 fits into 487 3 times, leaving a remainder of 100.
Put 3 as the next digit of the answer. 
Result so far: 163.0
If we subtract 387 from 487, we get 100.
Grab the next digit (9) from the dividend, add it to 100, then carry on: 1009 / 129

Let's proceed to step 6:
When dividing 1009 by 129, we get 7 with a remainder of 106.
Write down 7 as next digit of the result. 
Result so far: 1637.0
Subtracting 903 from 1009 leaves us with 106.
Take the next digit (0) from the dividend and append it to 106, then repeat: 1060 / 129

Moving on to step 7:
1060 divided by 129 is 8 with a remainder of 28.
Put 8 as the next digit of the answer. 
Result so far: 16378.0
The remainder is 28 after subtracting 1032 from 1060.
Include the next digit (9) from the dividend after 28, then repeat: 289 / 129

Advancing to step 8:
129 can be fit into 289 2 times, resulting in a remainder of 31.
Use 2 as the next digit of our solution. 
Result so far: 163782.0
The remainder is 31 after subtracting 258 from 289.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Let's proceed to step 9:
310 divided by 129 is 2 with a remainder of 52.
Put 2 as the next digit of the answer. 
Result so far: 163782.2
Subtracting 258 from 310 leaves us with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Let's proceed to step 10:
If we divide 520 by 129, we get 4 and a remainder of 4.
Use 4 as the next digit of our solution. 
Result so far: 163782.24
The remainder is 4 after subtracting 516 from 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 11:
40 divided by 129 is 0 with a remainder of 40.
The number 0 becomes the next digit in our result. 
Result so far: 163782.24
If we subtract 0 from 40, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 12:
If we divide 400 by 129, we get 3 and a remainder of 13.
The number 3 becomes the next digit in our result. 
Result so far: 163782.2403
Deduct 387 from 400 and we're left with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Step 13:
129 goes into 130 1 times with a remainder of 1.
Record the quotient 1 as the next digit in the result. 
Result so far: 163782.24031
If we subtract 129 from 130, we 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:
If we divide 10 by 129, we get 0 and a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 163782.24031
Subtracting 0 from 10 leaves us 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 15:
100 divided by 129 is 0 with a remainder of 100.
The next digit of our result is 0. 
Result so far: 163782.24031
The remainder is 100 after subtracting 0 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

In conclusion, the division gives 163782.24031 with a balance of 1e-06.