We're dividing 808164 by 21 
Let's see how many times 21 fits into 808164.

Let's proceed to step 1:
8 divided by 21 is 0 with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Grab the next digit (0) from the dividend, add it to 8, then carry on: 80 / 21

Going ahead to step 2:
If we divide 80 by 21, we get 3 and a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Subtract 63 from 80 to get 17.
Include the next digit (8) from the dividend after 17, then repeat: 178 / 21

Step 3:
178 divided by 21 is 8 with a remainder of 10.
Write down 8 as next digit of the result. 
Result so far: 38.0
The remainder is 10 after subtracting 168 from 178.
Include the next digit (1) from the dividend after 10, then repeat: 101 / 21

Advancing to step 4:
21 can be fit into 101 4 times, resulting in a remainder of 17.
Use 4 as the next digit of our solution. 
Result so far: 384.0
Subtract 84 from 101 to get 17.
Take the next digit (6) from the dividend and append it to 17, then repeat: 176 / 21

Advancing to step 5:
21 goes into 176 8 times with a remainder of 8.
The next digit of our result is 8. 
Result so far: 3848.0
If we take 168 away from 176, we end up with 8.
Include the next digit (4) from the dividend after 8, then repeat: 84 / 21

Let's proceed to step 6:
When dividing 84 by 21, we get 4 with a remainder of 0.
The number 4 becomes the next digit in our result. 
Result so far: 38484.0
Deduct 84 from 84 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 7:
0 divided by 21 is 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 38484.0
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 8:
21 goes into 0 0 times with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 38484.0
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 38484.0, with a leftover of 0.0.