8201396 ÷ 21 
Let's see how many times 21 fits into 8201396.

On 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
Subtracting 0 from 8 leaves us with 8.
Grab the next digit (2) from the dividend, add it to 8, then carry on: 82 / 21

Advancing to step 2:
21 goes into 82 3 times with a remainder of 19.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
If we take 63 away from 82, we end up with 19.
Bring next digit (0) of the dividend behind the 19 and repeat the process: 190 / 21

Moving on to step 3:
21 goes into 190 9 times with a remainder of 1.
Use 9 as the next digit of our solution. 
Result so far: 39.0
If we take 189 away from 190, we end up with 1.
Grab the next digit (1) from the dividend, add it to 1, then carry on: 11 / 21

Moving on to step 4:
21 goes into 11 0 times with a remainder of 11.
Record the quotient 0 as the next digit in the result. 
Result so far: 390.0
Deduct 0 from 11 and we're left with 11.
Bring next digit (3) of the dividend behind the 11 and repeat the process: 113 / 21

On to step 5:
The number 21 fits into 113 5 times, leaving a remainder of 8.
The number 5 becomes the next digit in our result. 
Result so far: 3905.0
Deduct 105 from 113 and we're left with 8.
Append the next digit (9) from the dividend to 8 and continue with: 89 / 21

Let's proceed to step 6:
If we divide 89 by 21, we get 4 and a remainder of 5.
Use 4 as the next digit of our solution. 
Result so far: 39054.0
The remainder is 5 after subtracting 84 from 89.
Fetch the next digit (6) from the dividend, attach it to 5 and continue: 56 / 21

Let's proceed to step 7:
21 goes into 56 2 times with a remainder of 14.
Record the quotient 2 as the next digit in the result. 
Result so far: 390542.0
Deduct 42 from 56 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Moving on to step 8:
If we divide 140 by 21, we get 6 and a remainder of 14.
Put 6 as the next digit of the answer. 
Result so far: 390542.6
Subtract 126 from 140 to get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Let's proceed to step 9:
21 goes into 140 6 times with a remainder of 14.
Use 6 as the next digit of our solution. 
Result so far: 390542.66
If we take 126 away from 140, we end up with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Our division results in 390542.66 with a remaining 0.014.