509169 divided by 21 
Our goal is to divide 509169 by 21.

Step 1:
21 goes into 5 0 times with a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Grab the next digit (0) from the dividend, add it to 5, then carry on: 50 / 21

On to step 2:
21 can be fit into 50 2 times, resulting in a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtract 42 from 50 to get 8.
Include the next digit (9) from the dividend after 8, then repeat: 89 / 21

Moving on to step 3:
21 goes into 89 4 times with a remainder of 5.
The next digit of our result is 4. 
Result so far: 24.0
If we take 84 away from 89, we end up with 5.
Fetch the next digit (1) from the dividend, attach it to 5 and continue: 51 / 21

On to step 4:
If we divide 51 by 21, we get 2 and a remainder of 9.
Write down 2 as next digit of the result. 
Result so far: 242.0
Subtracting 42 from 51 leaves us with 9.
Grab the next digit (6) from the dividend, add it to 9, then carry on: 96 / 21

Moving on to step 5:
21 goes into 96 4 times with a remainder of 12.
Write down 4 as next digit of the result. 
Result so far: 2424.0
The remainder is 12 after subtracting 84 from 96.
Append the next digit (9) from the dividend to 12 and continue with: 129 / 21

Step 6:
129 divided by 21 is 6 with a remainder of 3.
Put 6 as the next digit of the answer. 
Result so far: 24246.0
Subtracting 126 from 129 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 7:
If we divide 30 by 21, we get 1 and a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 24246.1
If we take 21 away from 30, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 8:
If we divide 90 by 21, we get 4 and a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 24246.14
Subtract 84 from 90 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 9:
21 goes into 60 2 times with a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 24246.142
Subtracting 42 from 60 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 10:
180 divided by 21 is 8 with a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 24246.1428
Deduct 168 from 180 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.

Moving on to step 11:
120 divided by 21 is 5 with a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 24246.14285
Deduct 105 from 120 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 12:
21 goes into 150 7 times with a remainder of 3.
The next digit of our result is 7. 
Result so far: 24246.142857
The remainder is 3 after subtracting 147 from 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 13:
When dividing 30 by 21, we get 1 with a remainder of 9.
The next digit of our result is 1. 
Result so far: 24246.1428571
Deduct 21 from 30 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 14:
The number 21 fits into 90 4 times, leaving a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 24246.14285714
The remainder is 6 after subtracting 84 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

The final result is 24246.14285714 with a remainder of 6e-09.