We look at the division of 816679 by 21 
Let's see how many times 21 fits into 816679.

Moving on to step 1:
The number 21 fits into 8 0 times, leaving a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Bring next digit (1) of the dividend behind the 8 and repeat the process: 81 / 21

Step 2:
If we divide 81 by 21, we get 3 and a remainder of 18.
The next digit of our result is 3. 
Result so far: 3.0
The remainder is 18 after subtracting 63 from 81.
Take the next digit (6) from the dividend and append it to 18, then repeat: 186 / 21

Let's proceed to step 3:
21 goes into 186 8 times with a remainder of 18.
Use 8 as the next digit of our solution. 
Result so far: 38.0
Deduct 168 from 186 and we're left with 18.
Append the next digit (6) from the dividend to 18 and continue with: 186 / 21

On to step 4:
When dividing 186 by 21, we get 8 with a remainder of 18.
Record the quotient 8 as the next digit in the result. 
Result so far: 388.0
Subtract 168 from 186 to get 18.
Grab the next digit (7) from the dividend, add it to 18, then carry on: 187 / 21

On to step 5:
The number 21 fits into 187 8 times, leaving a remainder of 19.
The number 8 becomes the next digit in our result. 
Result so far: 3888.0
The remainder is 19 after subtracting 168 from 187.
Bring next digit (9) of the dividend behind the 19 and repeat the process: 199 / 21

Moving on to step 6:
21 goes into 199 9 times with a remainder of 10.
Record the quotient 9 as the next digit in the result. 
Result so far: 38889.0
The remainder is 10 after subtracting 189 from 199.
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 7:
The number 21 fits into 100 4 times, leaving a remainder of 16.
Write down 4 as next digit of the result. 
Result so far: 38889.4
Deduct 84 from 100 and we're left 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.

Advancing to step 8:
21 goes into 160 7 times with a remainder of 13.
Put 7 as the next digit of the answer. 
Result so far: 38889.47
Deduct 147 from 160 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.

Going ahead to step 9:
The number 21 fits into 130 6 times, leaving a remainder of 4.
The next digit of our result is 6. 
Result so far: 38889.476
Subtract 126 from 130 to 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.

Let's proceed to step 10:
If we divide 40 by 21, we get 1 and a remainder of 19.
Use 1 as the next digit of our solution. 
Result so far: 38889.4761
Subtract 21 from 40 to get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Step 11:
190 divided by 21 is 9 with a remainder of 1.
Use 9 as the next digit of our solution. 
Result so far: 38889.47619
Deduct 189 from 190 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 12:
If we divide 10 by 21, we get 0 and a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 38889.47619
The remainder is 10 after subtracting 0 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 13:
If we divide 100 by 21, we get 4 and a remainder of 16.
Put 4 as the next digit of the answer. 
Result so far: 38889.4761904
Deduct 84 from 100 and we're left 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.

Let's proceed to step 14:
When dividing 160 by 21, we get 7 with a remainder of 13.
The number 7 becomes the next digit in our result. 
Result so far: 38889.47619047
Subtracting 147 from 160 leaves us 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.

The final outcome is 38889.47619047, with a leftover of 1.3e-08.