12721521 divided by 54 
We want to figure out the number of times 12721521 can be divided by 54.

Moving on to step 1:
If we divide 1 by 54, we get 0 and a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 54

Going ahead to step 2:
54 can be fit into 12 0 times, resulting in a remainder of 12.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 12 leaves us with 12.
Include the next digit (7) from the dividend after 12, then repeat: 127 / 54

Going ahead to step 3:
54 goes into 127 2 times with a remainder of 19.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Subtract 108 from 127 to get 19.
Bring next digit (2) of the dividend behind the 19 and repeat the process: 192 / 54

Moving on to step 4:
192 divided by 54 is 3 with a remainder of 30.
The number 3 becomes the next digit in our result. 
Result so far: 23.0
Subtracting 162 from 192 leaves us with 30.
Include the next digit (1) from the dividend after 30, then repeat: 301 / 54

Advancing to step 5:
301 divided by 54 is 5 with a remainder of 31.
The next digit of our result is 5. 
Result so far: 235.0
Subtracting 270 from 301 leaves us with 31.
Grab the next digit (5) from the dividend, add it to 31, then carry on: 315 / 54

On to step 6:
When dividing 315 by 54, we get 5 with a remainder of 45.
Record the quotient 5 as the next digit in the result. 
Result so far: 2355.0
Subtracting 270 from 315 leaves us with 45.
Bring next digit (2) of the dividend behind the 45 and repeat the process: 452 / 54

Step 7:
If we divide 452 by 54, we get 8 and a remainder of 20.
Use 8 as the next digit of our solution. 
Result so far: 23558.0
The remainder is 20 after subtracting 432 from 452.
Include the next digit (1) from the dividend after 20, then repeat: 201 / 54

Advancing to step 8:
201 divided by 54 is 3 with a remainder of 39.
Record the quotient 3 as the next digit in the result. 
Result so far: 235583.0
Deduct 162 from 201 and we're left with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Moving on to step 9:
When dividing 390 by 54, we get 7 with a remainder of 12.
Write down 7 as next digit of the result. 
Result so far: 235583.7
Subtract 378 from 390 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 10:
120 divided by 54 is 2 with a remainder of 12.
Write down 2 as next digit of the result. 
Result so far: 235583.72
Deduct 108 from 120 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 11:
54 goes into 120 2 times with a remainder of 12.
Write down 2 as next digit of the result. 
Result so far: 235583.722
If we take 108 away from 120, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

The final result is 235583.722 with a remainder of 0.0012.