801360 ÷ 21 
We want to divide 801360 by 21.

Let's proceed to step 1:
If we divide 8 by 21, we get 0 and a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Append the next digit (0) from the dividend to 8 and continue with: 80 / 21

Step 2:
21 can be fit into 80 3 times, resulting in a remainder of 17.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
Subtract 63 from 80 to get 17.
Fetch the next digit (1) from the dividend, attach it to 17 and continue: 171 / 21

Going ahead to step 3:
The number 21 fits into 171 8 times, leaving a remainder of 3.
The number 8 becomes the next digit in our result. 
Result so far: 38.0
If we subtract 168 from 171, we get 3.
Take the next digit (3) from the dividend and append it to 3, then repeat: 33 / 21

On to step 4:
When dividing 33 by 21, we get 1 with a remainder of 12.
Use 1 as the next digit of our solution. 
Result so far: 381.0
If we subtract 21 from 33, we get 12.
Append the next digit (6) from the dividend to 12 and continue with: 126 / 21

Moving on to step 5:
If we divide 126 by 21, we get 6 and a remainder of 0.
The number 6 becomes the next digit in our result. 
Result so far: 3816.0
If we subtract 126 from 126, we get 0.
Append the next digit (0) from the dividend to 0 and continue with: 0 / 21

Moving on to step 6:
When dividing 0 by 21, we get 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 38160.0
Subtracting 0 from 0 leaves us 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 7:
When dividing 0 by 21, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 38160.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 8:
When dividing 0 by 21, we get 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 38160.0
Deduct 0 from 0 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.

The final outcome is 38160.0, with a leftover of 0.0.