21739988 divided by 421 
We want to figure out the number of times 21739988 can be divided by 421.

Let's proceed to step 1:
2 divided by 421 is 0 with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 421

Moving on to step 2:
21 divided by 421 is 0 with a remainder of 21.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 21 after subtracting 0 from 21.
Grab the next digit (7) from the dividend, add it to 21, then carry on: 217 / 421

Step 3:
When dividing 217 by 421, we get 0 with a remainder of 217.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 217, we end up with 217.
Fetch the next digit (3) from the dividend, attach it to 217 and continue: 2173 / 421

Let's proceed to step 4:
The number 421 fits into 2173 5 times, leaving a remainder of 68.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
Subtracting 2105 from 2173 leaves us with 68.
Bring next digit (9) of the dividend behind the 68 and repeat the process: 689 / 421

On to step 5:
If we divide 689 by 421, we get 1 and a remainder of 268.
Put 1 as the next digit of the answer. 
Result so far: 51.0
Subtracting 421 from 689 leaves us with 268.
Include the next digit (9) from the dividend after 268, then repeat: 2689 / 421

Let's proceed to step 6:
If we divide 2689 by 421, we get 6 and a remainder of 163.
Write down 6 as next digit of the result. 
Result so far: 516.0
If we subtract 2526 from 2689, we get 163.
Include the next digit (8) from the dividend after 163, then repeat: 1638 / 421

Let's proceed to step 7:
1638 divided by 421 is 3 with a remainder of 375.
The number 3 becomes the next digit in our result. 
Result so far: 5163.0
If we take 1263 away from 1638, we end up with 375.
Include the next digit (8) from the dividend after 375, then repeat: 3758 / 421

Step 8:
421 goes into 3758 8 times with a remainder of 390.
Put 8 as the next digit of the answer. 
Result so far: 51638.0
If we take 3368 away from 3758, we end up with 390.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3900, and continue the process.

On to step 9:
If we divide 3900 by 421, we get 9 and a remainder of 111.
The number 9 becomes the next digit in our result. 
Result so far: 51638.9
The remainder is 111 after subtracting 3789 from 3900.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1110, and continue the process.

Advancing to step 10:
When dividing 1110 by 421, we get 2 with a remainder of 268.
Write down 2 as next digit of the result. 
Result so far: 51638.92
If we take 842 away from 1110, we end up with 268.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2680, and continue the process.

Advancing to step 11:
When dividing 2680 by 421, we get 6 with a remainder of 154.
Use 6 as the next digit of our solution. 
Result so far: 51638.926
Subtract 2526 from 2680 to get 154.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1540, and continue the process.

Advancing to step 12:
When dividing 1540 by 421, we get 3 with a remainder of 277.
Use 3 as the next digit of our solution. 
Result so far: 51638.9263
The remainder is 277 after subtracting 1263 from 1540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2770, and continue the process.

Let's proceed to step 13:
2770 divided by 421 is 6 with a remainder of 244.
The next digit of our result is 6. 
Result so far: 51638.92636
If we take 2526 away from 2770, we end up with 244.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2440, and continue the process.

Advancing to step 14:
421 can be fit into 2440 5 times, resulting in a remainder of 335.
Write down 5 as next digit of the result. 
Result so far: 51638.926365
Deduct 2105 from 2440 and we're left with 335.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3350, and continue the process.

Advancing to step 15:
3350 divided by 421 is 7 with a remainder of 403.
The number 7 becomes the next digit in our result. 
Result so far: 51638.9263657
Deduct 2947 from 3350 and we're left with 403.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4030, and continue the process.

Going ahead to step 16:
If we divide 4030 by 421, we get 9 and a remainder of 241.
The number 9 becomes the next digit in our result. 
Result so far: 51638.92636579
The remainder is 241 after subtracting 3789 from 4030.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2410, and continue the process.

In conclusion, the division gives 51638.92636579 with a balance of 2.41e-07.