We're dividing 498212 by 21 
We want to figure out the number of times 498212 can be divided by 21.

Let's proceed to step 1:
4 divided by 21 is 0 with a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Bring next digit (9) of the dividend behind the 4 and repeat the process: 49 / 21

Step 2:
49 divided by 21 is 2 with a remainder of 7.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtract 42 from 49 to get 7.
Grab the next digit (8) from the dividend, add it to 7, then carry on: 78 / 21

Advancing to step 3:
The number 21 fits into 78 3 times, leaving a remainder of 15.
The number 3 becomes the next digit in our result. 
Result so far: 23.0
Deduct 63 from 78 and we're left with 15.
Take the next digit (2) from the dividend and append it to 15, then repeat: 152 / 21

Moving on to step 4:
21 can be fit into 152 7 times, resulting in a remainder of 5.
Put 7 as the next digit of the answer. 
Result so far: 237.0
If we subtract 147 from 152, we get 5.
Grab the next digit (1) from the dividend, add it to 5, then carry on: 51 / 21

Going ahead to step 5:
If we divide 51 by 21, we get 2 and a remainder of 9.
The number 2 becomes the next digit in our result. 
Result so far: 2372.0
If we take 42 away from 51, we end up with 9.
Append the next digit (2) from the dividend to 9 and continue with: 92 / 21

Let's proceed to step 6:
The number 21 fits into 92 4 times, leaving a remainder of 8.
The number 4 becomes the next digit in our result. 
Result so far: 23724.0
Subtracting 84 from 92 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 7:
21 goes into 80 3 times with a remainder of 17.
Record the quotient 3 as the next digit in the result. 
Result so far: 23724.3
Subtract 63 from 80 to get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Moving on to step 8:
21 can be fit into 170 8 times, resulting in a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 23724.38
Deduct 168 from 170 and we're left with 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 9:
21 can be fit into 20 0 times, resulting in a remainder of 20.
The next digit of our result is 0. 
Result so far: 23724.38
Subtract 0 from 20 to 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.

Moving on to step 10:
The number 21 fits into 200 9 times, leaving a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 23724.3809
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.

On to step 11:
When dividing 110 by 21, we get 5 with a remainder of 5.
The next digit of our result is 5. 
Result so far: 23724.38095
If we subtract 105 from 110, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 12:
21 goes into 50 2 times with a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 23724.380952
If we take 42 away from 50, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 13:
21 can be fit into 80 3 times, resulting in a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 23724.3809523
Deduct 63 from 80 and we're left with 17.
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 14:
If we divide 170 by 21, we get 8 and a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 23724.38095238
Subtracting 168 from 170 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

After the division, we end up with 23724.38095238 and a remainder of 2e-09.