We divide 21135610 by 421
Our goal is to divide 21135610 by 421.

Advancing to step 1:
The number 421 fits into 2 0 times, leaving a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 421

Step 2:
421 goes into 21 0 times with a remainder of 21.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Take the next digit (1) from the dividend and append it to 21, then repeat: 211 / 421

Step 3:
If we divide 211 by 421, we get 0 and a remainder of 211.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 211, we end up with 211.
Grab the next digit (3) from the dividend, add it to 211, then carry on: 2113 / 421

Going ahead to step 4:
2113 divided by 421 is 5 with a remainder of 8.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
If we subtract 2105 from 2113, we get 8.
Bring next digit (5) of the dividend behind the 8 and repeat the process: 85 / 421

Going ahead to step 5:
85 divided by 421 is 0 with a remainder of 85.
Record the quotient 0 as the next digit in the result. 
Result so far: 50.0
Subtracting 0 from 85 leaves us with 85.
Append the next digit (6) from the dividend to 85 and continue with: 856 / 421

Moving on to step 6:
If we divide 856 by 421, we get 2 and a remainder of 14.
Use 2 as the next digit of our solution. 
Result so far: 502.0
If we subtract 842 from 856, we get 14.
Include the next digit (1) from the dividend after 14, then repeat: 141 / 421

On to step 7:
141 divided by 421 is 0 with a remainder of 141.
Put 0 as the next digit of the answer. 
Result so far: 5020.0
Subtract 0 from 141 to get 141.
Include the next digit (0) from the dividend after 141, then repeat: 1410 / 421

Moving on to step 8:
If we divide 1410 by 421, we get 3 and a remainder of 147.
The next digit of our result is 3. 
Result so far: 50203.0
If we subtract 1263 from 1410, we get 147.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1470, and continue the process.

Let's proceed to step 9:
The number 421 fits into 1470 3 times, leaving a remainder of 207.
Put 3 as the next digit of the answer. 
Result so far: 50203.3
Subtract 1263 from 1470 to get 207.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2070, and continue the process.

Going ahead to step 10:
If we divide 2070 by 421, we get 4 and a remainder of 386.
Use 4 as the next digit of our solution. 
Result so far: 50203.34
Deduct 1684 from 2070 and we're left with 386.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3860, and continue the process.

Step 11:
The number 421 fits into 3860 9 times, leaving a remainder of 71.
The next digit of our result is 9. 
Result so far: 50203.349
The remainder is 71 after subtracting 3789 from 3860.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Step 12:
710 divided by 421 is 1 with a remainder of 289.
Record the quotient 1 as the next digit in the result. 
Result so far: 50203.3491
The remainder is 289 after subtracting 421 from 710.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2890, and continue the process.

Advancing to step 13:
If we divide 2890 by 421, we get 6 and a remainder of 364.
The next digit of our result is 6. 
Result so far: 50203.34916
If we subtract 2526 from 2890, we get 364.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3640, and continue the process.

Step 14:
If we divide 3640 by 421, we get 8 and a remainder of 272.
Put 8 as the next digit of the answer. 
Result so far: 50203.349168
If we take 3368 away from 3640, we end up with 272.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2720, and continue the process.

Let's proceed to step 15:
421 can be fit into 2720 6 times, resulting in a remainder of 194.
The number 6 becomes the next digit in our result. 
Result so far: 50203.3491686
The remainder is 194 after subtracting 2526 from 2720.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1940, and continue the process.

Let's proceed to step 16:
When dividing 1940 by 421, we get 4 with a remainder of 256.
The next digit of our result is 4. 
Result so far: 50203.34916864
Deduct 1684 from 1940 and we're left with 256.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2560, and continue the process.

The final result is 50203.34916864 with a remainder of 2.56e-07.