21573459 ÷ 762 
We want to figure out the number of times 21573459 can be divided by 762.

Step 1:
2 divided by 762 is 0 with 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.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 762

Step 2:
762 goes into 21 0 times with a remainder of 21.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 21, we end up with 21.
Grab the next digit (5) from the dividend, add it to 21, then carry on: 215 / 762

On to step 3:
762 can be fit into 215 0 times, resulting in a remainder of 215.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 215 to get 215.
Bring next digit (7) of the dividend behind the 215 and repeat the process: 2157 / 762

Let's proceed to step 4:
2157 divided by 762 is 2 with a remainder of 633.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtracting 1524 from 2157 leaves us with 633.
Take the next digit (3) from the dividend and append it to 633, then repeat: 6333 / 762

Advancing to step 5:
762 can be fit into 6333 8 times, resulting in a remainder of 237.
Write down 8 as next digit of the result. 
Result so far: 28.0
Subtract 6096 from 6333 to get 237.
Grab the next digit (4) from the dividend, add it to 237, then carry on: 2374 / 762

Moving on to step 6:
762 can be fit into 2374 3 times, resulting in a remainder of 88.
Write down 3 as next digit of the result. 
Result so far: 283.0
The remainder is 88 after subtracting 2286 from 2374.
Bring next digit (5) of the dividend behind the 88 and repeat the process: 885 / 762

Advancing to step 7:
When dividing 885 by 762, we get 1 with a remainder of 123.
The number 1 becomes the next digit in our result. 
Result so far: 2831.0
Subtracting 762 from 885 leaves us with 123.
Take the next digit (9) from the dividend and append it to 123, then repeat: 1239 / 762

Moving on to step 8:
If we divide 1239 by 762, we get 1 and a remainder of 477.
Record the quotient 1 as the next digit in the result. 
Result so far: 28311.0
Subtract 762 from 1239 to get 477.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4770, and continue the process.

Advancing to step 9:
762 can be fit into 4770 6 times, resulting in a remainder of 198.
The number 6 becomes the next digit in our result. 
Result so far: 28311.6
If we subtract 4572 from 4770, we get 198.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1980, and continue the process.

On to step 10:
762 can be fit into 1980 2 times, resulting in a remainder of 456.
Use 2 as the next digit of our solution. 
Result so far: 28311.62
The remainder is 456 after subtracting 1524 from 1980.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4560, and continue the process.

Moving on to step 11:
When dividing 4560 by 762, we get 5 with a remainder of 750.
Put 5 as the next digit of the answer. 
Result so far: 28311.625
Deduct 3810 from 4560 and we're left with 750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7500, and continue the process.

Going ahead to step 12:
762 goes into 7500 9 times with a remainder of 642.
Use 9 as the next digit of our solution. 
Result so far: 28311.6259
Subtracting 6858 from 7500 leaves us with 642.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6420, and continue the process.

Step 13:
762 goes into 6420 8 times with a remainder of 324.
The next digit of our result is 8. 
Result so far: 28311.62598
If we take 6096 away from 6420, we end up with 324.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3240, and continue the process.

Going ahead to step 14:
When dividing 3240 by 762, we get 4 with a remainder of 192.
Record the quotient 4 as the next digit in the result. 
Result so far: 28311.625984
Subtracting 3048 from 3240 leaves us with 192.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1920, and continue the process.

Let's proceed to step 15:
762 can be fit into 1920 2 times, resulting in a remainder of 396.
Use 2 as the next digit of our solution. 
Result so far: 28311.6259842
Subtract 1524 from 1920 to get 396.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3960, and continue the process.

Let's proceed to step 16:
762 can be fit into 3960 5 times, resulting in a remainder of 150.
The number 5 becomes the next digit in our result. 
Result so far: 28311.62598425
If we subtract 3810 from 3960, we get 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

The final outcome is 28311.62598425, with a leftover of 1.5e-07.