We look at the division of 20421167 by 398 
Let's see how many times 398 fits into 20421167.

Let's proceed to step 1:
If we divide 2 by 398, we get 0 and a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Fetch the next digit (0) from the dividend, attach it to 2 and continue: 20 / 398

Step 2:
20 divided by 398 is 0 with a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 20 and we're left with 20.
Include the next digit (4) from the dividend after 20, then repeat: 204 / 398

Going ahead to step 3:
If we divide 204 by 398, we get 0 and a remainder of 204.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 204, we get 204.
Bring next digit (2) of the dividend behind the 204 and repeat the process: 2042 / 398

Step 4:
398 goes into 2042 5 times with a remainder of 52.
Write down 5 as next digit of the result. 
Result so far: 5.0
If we subtract 1990 from 2042, we get 52.
Bring next digit (1) of the dividend behind the 52 and repeat the process: 521 / 398

Going ahead to step 5:
The number 398 fits into 521 1 times, leaving a remainder of 123.
The number 1 becomes the next digit in our result. 
Result so far: 51.0
If we take 398 away from 521, we end up with 123.
Include the next digit (1) from the dividend after 123, then repeat: 1231 / 398

Advancing to step 6:
398 goes into 1231 3 times with a remainder of 37.
Write down 3 as next digit of the result. 
Result so far: 513.0
If we take 1194 away from 1231, we end up with 37.
Fetch the next digit (6) from the dividend, attach it to 37 and continue: 376 / 398

Let's proceed to step 7:
376 divided by 398 is 0 with a remainder of 376.
Put 0 as the next digit of the answer. 
Result so far: 5130.0
Deduct 0 from 376 and we're left with 376.
Bring next digit (7) of the dividend behind the 376 and repeat the process: 3767 / 398

Advancing to step 8:
When dividing 3767 by 398, we get 9 with a remainder of 185.
Use 9 as the next digit of our solution. 
Result so far: 51309.0
If we take 3582 away from 3767, we end up with 185.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1850, and continue the process.

Advancing to step 9:
If we divide 1850 by 398, we get 4 and a remainder of 258.
Put 4 as the next digit of the answer. 
Result so far: 51309.4
The remainder is 258 after subtracting 1592 from 1850.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2580, and continue the process.

Moving on to step 10:
The number 398 fits into 2580 6 times, leaving a remainder of 192.
Record the quotient 6 as the next digit in the result. 
Result so far: 51309.46
Subtract 2388 from 2580 to get 192.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1920, and continue the process.

Moving on to step 11:
When dividing 1920 by 398, we get 4 with a remainder of 328.
The next digit of our result is 4. 
Result so far: 51309.464
Deduct 1592 from 1920 and we're left with 328.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3280, and continue the process.

Let's proceed to step 12:
398 can be fit into 3280 8 times, resulting in a remainder of 96.
The next digit of our result is 8. 
Result so far: 51309.4648
The remainder is 96 after subtracting 3184 from 3280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

Step 13:
398 goes into 960 2 times with a remainder of 164.
Write down 2 as next digit of the result. 
Result so far: 51309.46482
If we take 796 away from 960, we end up with 164.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1640, and continue the process.

Going ahead to step 14:
398 goes into 1640 4 times with a remainder of 48.
Put 4 as the next digit of the answer. 
Result so far: 51309.464824
Subtract 1592 from 1640 to get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Going ahead to step 15:
398 can be fit into 480 1 times, resulting in a remainder of 82.
The number 1 becomes the next digit in our result. 
Result so far: 51309.4648241
Deduct 398 from 480 and we're left with 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Going ahead to step 16:
820 divided by 398 is 2 with a remainder of 24.
Write down 2 as next digit of the result. 
Result so far: 51309.46482412
If we subtract 796 from 820, we get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

In conclusion, the division gives 51309.46482412 with a balance of 2.4e-08.