We're dividing 21521423 by 629 
We want to figure out the number of times 21521423 can be divided by 629.

Let's proceed to step 1:
2 divided by 629 is 0 with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 629

Going ahead to step 2:
629 can be fit into 21 0 times, resulting in a remainder of 21.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 21 after subtracting 0 from 21.
Take the next digit (5) from the dividend and append it to 21, then repeat: 215 / 629

Let's proceed to step 3:
629 can be fit into 215 0 times, resulting in a remainder of 215.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 215, we end up with 215.
Fetch the next digit (2) from the dividend, attach it to 215 and continue: 2152 / 629

On to step 4:
When dividing 2152 by 629, we get 3 with a remainder of 265.
Put 3 as the next digit of the answer. 
Result so far: 3.0
Subtract 1887 from 2152 to get 265.
Append the next digit (1) from the dividend to 265 and continue with: 2651 / 629

Advancing to step 5:
2651 divided by 629 is 4 with a remainder of 135.
The number 4 becomes the next digit in our result. 
Result so far: 34.0
If we subtract 2516 from 2651, we get 135.
Include the next digit (4) from the dividend after 135, then repeat: 1354 / 629

On to step 6:
629 goes into 1354 2 times with a remainder of 96.
Put 2 as the next digit of the answer. 
Result so far: 342.0
Subtracting 1258 from 1354 leaves us with 96.
Fetch the next digit (2) from the dividend, attach it to 96 and continue: 962 / 629

Going ahead to step 7:
If we divide 962 by 629, we get 1 and a remainder of 333.
Use 1 as the next digit of our solution. 
Result so far: 3421.0
If we take 629 away from 962, we end up with 333.
Take the next digit (3) from the dividend and append it to 333, then repeat: 3333 / 629

Advancing to step 8:
3333 divided by 629 is 5 with a remainder of 188.
Put 5 as the next digit of the answer. 
Result so far: 34215.0
Subtract 3145 from 3333 to get 188.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1880, and continue the process.

Advancing to step 9:
The number 629 fits into 1880 2 times, leaving a remainder of 622.
Use 2 as the next digit of our solution. 
Result so far: 34215.2
If we take 1258 away from 1880, we end up with 622.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6220, and continue the process.

Advancing to step 10:
6220 divided by 629 is 9 with a remainder of 559.
The number 9 becomes the next digit in our result. 
Result so far: 34215.29
Subtract 5661 from 6220 to get 559.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5590, and continue the process.

Let's proceed to step 11:
If we divide 5590 by 629, we get 8 and a remainder of 558.
Write down 8 as next digit of the result. 
Result so far: 34215.298
The remainder is 558 after subtracting 5032 from 5590.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5580, and continue the process.

Let's proceed to step 12:
The number 629 fits into 5580 8 times, leaving a remainder of 548.
Write down 8 as next digit of the result. 
Result so far: 34215.2988
Subtracting 5032 from 5580 leaves us with 548.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5480, and continue the process.

In conclusion, the division gives 34215.2988 with a balance of 0.00548.