We look at the division of 509683 by 21 
We want to figure out the number of times 509683 can be divided by 21.

Advancing to step 1:
21 goes into 5 0 times with a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Append the next digit (0) from the dividend to 5 and continue with: 50 / 21

Let's proceed to step 2:
The number 21 fits into 50 2 times, leaving a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Subtracting 42 from 50 leaves us with 8.
Take the next digit (9) from the dividend and append it to 8, then repeat: 89 / 21

Going ahead to step 3:
21 goes into 89 4 times with a remainder of 5.
Put 4 as the next digit of the answer. 
Result so far: 24.0
If we take 84 away from 89, we end up with 5.
Fetch the next digit (6) from the dividend, attach it to 5 and continue: 56 / 21

Moving on to step 4:
56 divided by 21 is 2 with a remainder of 14.
Put 2 as the next digit of the answer. 
Result so far: 242.0
Deduct 42 from 56 and we're left with 14.
Include the next digit (8) from the dividend after 14, then repeat: 148 / 21

On to step 5:
21 goes into 148 7 times with a remainder of 1.
The number 7 becomes the next digit in our result. 
Result so far: 2427.0
The remainder is 1 after subtracting 147 from 148.
Grab the next digit (3) from the dividend, add it to 1, then carry on: 13 / 21

On to step 6:
21 goes into 13 0 times with a remainder of 13.
Put 0 as the next digit of the answer. 
Result so far: 24270.0
Deduct 0 from 13 and we're left with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Step 7:
130 divided by 21 is 6 with a remainder of 4.
Record the quotient 6 as the next digit in the result. 
Result so far: 24270.6
If we subtract 126 from 130, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 8:
21 goes into 40 1 times with a remainder of 19.
Use 1 as the next digit of our solution. 
Result so far: 24270.61
If we take 21 away from 40, we end up with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Advancing to step 9:
190 divided by 21 is 9 with a remainder of 1.
The next digit of our result is 9. 
Result so far: 24270.619
The remainder is 1 after subtracting 189 from 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 10:
21 can be fit into 10 0 times, resulting in a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 24270.619
If we take 0 away from 10, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 11:
21 goes into 100 4 times with a remainder of 16.
Use 4 as the next digit of our solution. 
Result so far: 24270.61904
Subtracting 84 from 100 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Step 12:
21 can be fit into 160 7 times, resulting in a remainder of 13.
Record the quotient 7 as the next digit in the result. 
Result so far: 24270.619047
If we take 147 away from 160, we end up with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Going ahead to step 13:
130 divided by 21 is 6 with a remainder of 4.
The next digit of our result is 6. 
Result so far: 24270.6190476
Subtracting 126 from 130 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 14:
40 divided by 21 is 1 with a remainder of 19.
The number 1 becomes the next digit in our result. 
Result so far: 24270.61904761
Deduct 21 from 40 and we're left with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

In conclusion, the division gives 24270.61904761 with a balance of 1.9e-08.