21120292 ÷ 51 
We want to figure out the number of times 21120292 can be divided by 51.

On to step 1:
2 divided by 51 is 0 with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 51

On to step 2:
51 can be fit into 21 0 times, resulting in a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 21 and we're left with 21.
Grab the next digit (1) from the dividend, add it to 21, then carry on: 211 / 51

Advancing to step 3:
51 can be fit into 211 4 times, resulting in a remainder of 7.
Use 4 as the next digit of our solution. 
Result so far: 4.0
Deduct 204 from 211 and we're left with 7.
Append the next digit (2) from the dividend to 7 and continue with: 72 / 51

Going ahead to step 4:
If we divide 72 by 51, we get 1 and a remainder of 21.
Write down 1 as next digit of the result. 
Result so far: 41.0
Subtracting 51 from 72 leaves us with 21.
Fetch the next digit (0) from the dividend, attach it to 21 and continue: 210 / 51

Let's proceed to step 5:
If we divide 210 by 51, we get 4 and a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 414.0
If we subtract 204 from 210, we get 6.
Bring next digit (2) of the dividend behind the 6 and repeat the process: 62 / 51

Let's proceed to step 6:
When dividing 62 by 51, we get 1 with a remainder of 11.
Record the quotient 1 as the next digit in the result. 
Result so far: 4141.0
Subtract 51 from 62 to get 11.
Bring next digit (9) of the dividend behind the 11 and repeat the process: 119 / 51

Moving on to step 7:
When dividing 119 by 51, we get 2 with a remainder of 17.
The number 2 becomes the next digit in our result. 
Result so far: 41412.0
If we subtract 102 from 119, we get 17.
Include the next digit (2) from the dividend after 17, then repeat: 172 / 51

Going ahead to step 8:
The number 51 fits into 172 3 times, leaving a remainder of 19.
Put 3 as the next digit of the answer. 
Result so far: 414123.0
Subtracting 153 from 172 leaves us with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Step 9:
The number 51 fits into 190 3 times, leaving a remainder of 37.
Use 3 as the next digit of our solution. 
Result so far: 414123.3
The remainder is 37 after subtracting 153 from 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Moving on to step 10:
If we divide 370 by 51, we get 7 and a remainder of 13.
Write down 7 as next digit of the result. 
Result so far: 414123.37
If we subtract 357 from 370, we get 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 11:
51 goes into 130 2 times with a remainder of 28.
The number 2 becomes the next digit in our result. 
Result so far: 414123.372
If we take 102 away from 130, we end up with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Moving on to step 12:
The number 51 fits into 280 5 times, leaving a remainder of 25.
Write down 5 as next digit of the result. 
Result so far: 414123.3725
If we subtract 255 from 280, we get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

On to step 13:
51 goes into 250 4 times with a remainder of 46.
The next digit of our result is 4. 
Result so far: 414123.37254
If we subtract 204 from 250, we get 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Advancing to step 14:
51 can be fit into 460 9 times, resulting in a remainder of 1.
Record the quotient 9 as the next digit in the result. 
Result so far: 414123.372549
Subtracting 459 from 460 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 15:
If we divide 10 by 51, we get 0 and a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 414123.372549
The remainder is 10 after subtracting 0 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 16:
The number 51 fits into 100 1 times, leaving a remainder of 49.
The next digit of our result is 1. 
Result so far: 414123.37254901
If we take 51 away from 100, we end up with 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

In conclusion, the division gives 414123.37254901 with a balance of 4.9e-08.