We look at the division of 938573 by 21 
We want to figure out the number of times 938573 can be divided by 21.

Step 1:
If we divide 9 by 21, we get 0 and a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Fetch the next digit (3) from the dividend, attach it to 9 and continue: 93 / 21

On to step 2:
21 goes into 93 4 times with a remainder of 9.
Use 4 as the next digit of our solution. 
Result so far: 4.0
If we take 84 away from 93, we end up with 9.
Append the next digit (8) from the dividend to 9 and continue with: 98 / 21

Moving on to step 3:
21 goes into 98 4 times with a remainder of 14.
The number 4 becomes the next digit in our result. 
Result so far: 44.0
If we take 84 away from 98, we end up with 14.
Append the next digit (5) from the dividend to 14 and continue with: 145 / 21

On to step 4:
21 goes into 145 6 times with a remainder of 19.
Write down 6 as next digit of the result. 
Result so far: 446.0
Subtracting 126 from 145 leaves us with 19.
Append the next digit (7) from the dividend to 19 and continue with: 197 / 21

Moving on to step 5:
If we divide 197 by 21, we get 9 and a remainder of 8.
The next digit of our result is 9. 
Result so far: 4469.0
If we subtract 189 from 197, we get 8.
Include the next digit (3) from the dividend after 8, then repeat: 83 / 21

On to step 6:
The number 21 fits into 83 3 times, leaving a remainder of 20.
Put 3 as the next digit of the answer. 
Result so far: 44693.0
If we subtract 63 from 83, we 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.

On to step 7:
21 can be fit into 200 9 times, resulting in a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 44693.9
Subtracting 189 from 200 leaves us 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.

Step 8:
The number 21 fits into 110 5 times, leaving a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 44693.95
If we take 105 away from 110, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 9:
21 can be fit into 50 2 times, resulting in a remainder of 8.
The next digit of our result is 2. 
Result so far: 44693.952
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.

Let's proceed to step 10:
When dividing 80 by 21, we get 3 with a remainder of 17.
The next digit of our result is 3. 
Result so far: 44693.9523
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.

On to step 11:
21 can be fit into 170 8 times, resulting in a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 44693.95238
If we subtract 168 from 170, we get 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 12:
21 goes into 20 0 times with a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 44693.95238
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 13:
200 divided by 21 is 9 with a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 44693.9523809
If we take 189 away from 200, we end up 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 14:
If we divide 110 by 21, we get 5 and a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 44693.95238095
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.

The quotient of the division is 44693.95238095, and the remainder is 5e-09.