21617270 ÷ 421 
Our goal is to divide 21617270 by 421.

Going ahead to step 1:
421 can be fit into 2 0 times, resulting in a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 421

On to step 2:
The number 421 fits into 21 0 times, leaving a remainder of 21.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 21 leaves us with 21.
Fetch the next digit (6) from the dividend, attach it to 21 and continue: 216 / 421

Step 3:
421 can be fit into 216 0 times, resulting in a remainder of 216.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 216, we end up with 216.
Take the next digit (1) from the dividend and append it to 216, then repeat: 2161 / 421

Let's proceed to step 4:
When dividing 2161 by 421, we get 5 with a remainder of 56.
The next digit of our result is 5. 
Result so far: 5.0
Subtracting 2105 from 2161 leaves us with 56.
Append the next digit (7) from the dividend to 56 and continue with: 567 / 421

Let's proceed to step 5:
When dividing 567 by 421, we get 1 with a remainder of 146.
Write down 1 as next digit of the result. 
Result so far: 51.0
If we subtract 421 from 567, we get 146.
Append the next digit (2) from the dividend to 146 and continue with: 1462 / 421

Step 6:
When dividing 1462 by 421, we get 3 with a remainder of 199.
Put 3 as the next digit of the answer. 
Result so far: 513.0
The remainder is 199 after subtracting 1263 from 1462.
Take the next digit (7) from the dividend and append it to 199, then repeat: 1997 / 421

Advancing to step 7:
421 can be fit into 1997 4 times, resulting in a remainder of 313.
Write down 4 as next digit of the result. 
Result so far: 5134.0
If we subtract 1684 from 1997, we get 313.
Include the next digit (0) from the dividend after 313, then repeat: 3130 / 421

Let's proceed to step 8:
421 goes into 3130 7 times with a remainder of 183.
Put 7 as the next digit of the answer. 
Result so far: 51347.0
The remainder is 183 after subtracting 2947 from 3130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1830, and continue the process.

Step 9:
When dividing 1830 by 421, we get 4 with a remainder of 146.
Write down 4 as next digit of the result. 
Result so far: 51347.4
Deduct 1684 from 1830 and we're left with 146.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1460, and continue the process.

Step 10:
The number 421 fits into 1460 3 times, leaving a remainder of 197.
Record the quotient 3 as the next digit in the result. 
Result so far: 51347.43
Subtracting 1263 from 1460 leaves us with 197.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1970, and continue the process.

Step 11:
When dividing 1970 by 421, we get 4 with a remainder of 286.
Use 4 as the next digit of our solution. 
Result so far: 51347.434
Subtract 1684 from 1970 to get 286.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2860, and continue the process.

Let's proceed to step 12:
If we divide 2860 by 421, we get 6 and a remainder of 334.
Use 6 as the next digit of our solution. 
Result so far: 51347.4346
If we take 2526 away from 2860, we end up with 334.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3340, and continue the process.

Advancing to step 13:
If we divide 3340 by 421, we get 7 and a remainder of 393.
Put 7 as the next digit of the answer. 
Result so far: 51347.43467
If we take 2947 away from 3340, we end up with 393.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3930, and continue the process.

Moving on to step 14:
3930 divided by 421 is 9 with a remainder of 141.
Use 9 as the next digit of our solution. 
Result so far: 51347.434679
Deduct 3789 from 3930 and we're left with 141.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1410, and continue the process.

Let's proceed to step 15:
When dividing 1410 by 421, we get 3 with a remainder of 147.
Use 3 as the next digit of our solution. 
Result so far: 51347.4346793
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.

Going ahead to step 16:
421 can be fit into 1470 3 times, resulting in a remainder of 207.
Put 3 as the next digit of the answer. 
Result so far: 51347.43467933
Deduct 1263 from 1470 and we're left with 207.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2070, and continue the process.

After the division, we end up with 51347.43467933 and a remainder of 2.07e-07.