We look at the division of 837335 by 21 
We're looking to find how many times 21 goes into 837335.

Going ahead to step 1:
If we divide 8 by 21, we get 0 and a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Fetch the next digit (3) from the dividend, attach it to 8 and continue: 83 / 21

Going ahead to step 2:
21 can be fit into 83 3 times, resulting in a remainder of 20.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
Subtracting 63 from 83 leaves us with 20.
Fetch the next digit (7) from the dividend, attach it to 20 and continue: 207 / 21

On to step 3:
The number 21 fits into 207 9 times, leaving a remainder of 18.
Record the quotient 9 as the next digit in the result. 
Result so far: 39.0
Deduct 189 from 207 and we're left with 18.
Append the next digit (3) from the dividend to 18 and continue with: 183 / 21

Advancing to step 4:
21 can be fit into 183 8 times, resulting in a remainder of 15.
The next digit of our result is 8. 
Result so far: 398.0
Deduct 168 from 183 and we're left with 15.
Grab the next digit (3) from the dividend, add it to 15, then carry on: 153 / 21

Step 5:
If we divide 153 by 21, we get 7 and a remainder of 6.
Record the quotient 7 as the next digit in the result. 
Result so far: 3987.0
Deduct 147 from 153 and we're left with 6.
Bring next digit (5) of the dividend behind the 6 and repeat the process: 65 / 21

Going ahead to step 6:
21 goes into 65 3 times with a remainder of 2.
Record the quotient 3 as the next digit in the result. 
Result so far: 39873.0
Subtract 63 from 65 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 7:
The number 21 fits into 20 0 times, leaving a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 39873.0
If we subtract 0 from 20, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 8:
The number 21 fits into 200 9 times, leaving a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 39873.09
Deduct 189 from 200 and we're left with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 9:
21 goes into 110 5 times with a remainder of 5.
The next digit of our result is 5. 
Result so far: 39873.095
If we take 105 away from 110, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 10:
21 goes into 50 2 times with a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 39873.0952
The remainder is 8 after subtracting 42 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 11:
When dividing 80 by 21, we get 3 with a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 39873.09523
The remainder is 17 after subtracting 63 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Let's proceed to step 12:
170 divided by 21 is 8 with a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 39873.095238
Subtract 168 from 170 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 13:
If we divide 20 by 21, we get 0 and a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 39873.095238
If we subtract 0 from 20, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 14:
21 goes into 200 9 times with a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 39873.09523809
If we subtract 189 from 200, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

After the division, we end up with 39873.09523809 and a remainder of 1.1e-08.