21575517 divided by 509 
We want to divide 21575517 by 509.

On to step 1:
2 divided by 509 is 0 with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 509

Advancing to step 2:
509 can be fit into 21 0 times, resulting in a remainder of 21.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 21, we end up with 21.
Fetch the next digit (5) from the dividend, attach it to 21 and continue: 215 / 509

On to step 3:
The number 509 fits into 215 0 times, leaving a remainder of 215.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 215 and we're left with 215.
Fetch the next digit (7) from the dividend, attach it to 215 and continue: 2157 / 509

Advancing to step 4:
509 goes into 2157 4 times with a remainder of 121.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
If we subtract 2036 from 2157, we get 121.
Append the next digit (5) from the dividend to 121 and continue with: 1215 / 509

Advancing to step 5:
1215 divided by 509 is 2 with a remainder of 197.
The number 2 becomes the next digit in our result. 
Result so far: 42.0
If we take 1018 away from 1215, we end up with 197.
Grab the next digit (5) from the dividend, add it to 197, then carry on: 1975 / 509

On to step 6:
1975 divided by 509 is 3 with a remainder of 448.
Write down 3 as next digit of the result. 
Result so far: 423.0
If we subtract 1527 from 1975, we get 448.
Fetch the next digit (1) from the dividend, attach it to 448 and continue: 4481 / 509

Moving on to step 7:
When dividing 4481 by 509, we get 8 with a remainder of 409.
The number 8 becomes the next digit in our result. 
Result so far: 4238.0
If we subtract 4072 from 4481, we get 409.
Bring next digit (7) of the dividend behind the 409 and repeat the process: 4097 / 509

On to step 8:
4097 divided by 509 is 8 with a remainder of 25.
Write down 8 as next digit of the result. 
Result so far: 42388.0
The remainder is 25 after subtracting 4072 from 4097.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Step 9:
When dividing 250 by 509, we get 0 with a remainder of 250.
Record the quotient 0 as the next digit in the result. 
Result so far: 42388.0
The remainder is 250 after subtracting 0 from 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2500, and continue the process.

Moving on to step 10:
When dividing 2500 by 509, we get 4 with a remainder of 464.
Put 4 as the next digit of the answer. 
Result so far: 42388.04
Deduct 2036 from 2500 and we're left with 464.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4640, and continue the process.

Moving on to step 11:
4640 divided by 509 is 9 with a remainder of 59.
Use 9 as the next digit of our solution. 
Result so far: 42388.049
Deduct 4581 from 4640 and we're left with 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Going ahead to step 12:
590 divided by 509 is 1 with a remainder of 81.
Use 1 as the next digit of our solution. 
Result so far: 42388.0491
Subtracting 509 from 590 leaves us with 81.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

Step 13:
If we divide 810 by 509, we get 1 and a remainder of 301.
The number 1 becomes the next digit in our result. 
Result so far: 42388.04911
Deduct 509 from 810 and we're left with 301.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3010, and continue the process.

The quotient of the division is 42388.04911, and the remainder is 0.000301.