21285471 divided by 717 
We want to figure out the number of times 21285471 can be divided by 717.

Step 1:
717 goes into 2 0 times with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 717

Going ahead to step 2:
717 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
If we subtract 0 from 21, we get 21.
Append the next digit (2) from the dividend to 21 and continue with: 212 / 717

Let's proceed to step 3:
212 divided by 717 is 0 with a remainder of 212.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 212, we end up with 212.
Bring next digit (8) of the dividend behind the 212 and repeat the process: 2128 / 717

Step 4:
If we divide 2128 by 717, we get 2 and a remainder of 694.
The next digit of our result is 2. 
Result so far: 2.0
Subtract 1434 from 2128 to get 694.
Fetch the next digit (5) from the dividend, attach it to 694 and continue: 6945 / 717

Advancing to step 5:
The number 717 fits into 6945 9 times, leaving a remainder of 492.
Put 9 as the next digit of the answer. 
Result so far: 29.0
If we take 6453 away from 6945, we end up with 492.
Take the next digit (4) from the dividend and append it to 492, then repeat: 4924 / 717

Step 6:
The number 717 fits into 4924 6 times, leaving a remainder of 622.
Put 6 as the next digit of the answer. 
Result so far: 296.0
If we subtract 4302 from 4924, we get 622.
Bring next digit (7) of the dividend behind the 622 and repeat the process: 6227 / 717

Advancing to step 7:
The number 717 fits into 6227 8 times, leaving a remainder of 491.
Record the quotient 8 as the next digit in the result. 
Result so far: 2968.0
The remainder is 491 after subtracting 5736 from 6227.
Include the next digit (1) from the dividend after 491, then repeat: 4911 / 717

On to step 8:
The number 717 fits into 4911 6 times, leaving a remainder of 609.
The next digit of our result is 6. 
Result so far: 29686.0
Subtracting 4302 from 4911 leaves us with 609.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6090, and continue the process.

Let's proceed to step 9:
If we divide 6090 by 717, we get 8 and a remainder of 354.
The next digit of our result is 8. 
Result so far: 29686.8
Subtract 5736 from 6090 to get 354.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3540, and continue the process.

Advancing to step 10:
When dividing 3540 by 717, we get 4 with a remainder of 672.
Record the quotient 4 as the next digit in the result. 
Result so far: 29686.84
Subtracting 2868 from 3540 leaves us with 672.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6720, and continue the process.

On to step 11:
When dividing 6720 by 717, we get 9 with a remainder of 267.
Use 9 as the next digit of our solution. 
Result so far: 29686.849
If we take 6453 away from 6720, we end up with 267.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2670, and continue the process.

Step 12:
When dividing 2670 by 717, we get 3 with a remainder of 519.
The next digit of our result is 3. 
Result so far: 29686.8493
If we take 2151 away from 2670, we end up with 519.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5190, and continue the process.

On to step 13:
5190 divided by 717 is 7 with a remainder of 171.
Record the quotient 7 as the next digit in the result. 
Result so far: 29686.84937
Subtract 5019 from 5190 to get 171.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1710, and continue the process.

On to step 14:
If we divide 1710 by 717, we get 2 and a remainder of 276.
The number 2 becomes the next digit in our result. 
Result so far: 29686.849372
If we subtract 1434 from 1710, we get 276.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2760, and continue the process.

On to step 15:
When dividing 2760 by 717, we get 3 with a remainder of 609.
Record the quotient 3 as the next digit in the result. 
Result so far: 29686.8493723
Subtract 2151 from 2760 to get 609.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6090, and continue the process.

Going ahead to step 16:
717 goes into 6090 8 times with a remainder of 354.
Put 8 as the next digit of the answer. 
Result so far: 29686.84937238
Subtracting 5736 from 6090 leaves us with 354.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3540, and continue the process.

The final outcome is 29686.84937238, with a leftover of 3.54e-07.