We're dividing 538546 by 21 
We want to figure out the number of times 538546 can be divided by 21.

Let's proceed to step 1:
When dividing 5 by 21, we get 0 with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Bring next digit (3) of the dividend behind the 5 and repeat the process: 53 / 21

On to step 2:
When dividing 53 by 21, we get 2 with a remainder of 11.
The next digit of our result is 2. 
Result so far: 2.0
Subtracting 42 from 53 leaves us with 11.
Take the next digit (8) from the dividend and append it to 11, then repeat: 118 / 21

Going ahead to step 3:
If we divide 118 by 21, we get 5 and a remainder of 13.
Record the quotient 5 as the next digit in the result. 
Result so far: 25.0
Subtracting 105 from 118 leaves us with 13.
Grab the next digit (5) from the dividend, add it to 13, then carry on: 135 / 21

Advancing to step 4:
135 divided by 21 is 6 with a remainder of 9.
The number 6 becomes the next digit in our result. 
Result so far: 256.0
If we subtract 126 from 135, we get 9.
Bring next digit (4) of the dividend behind the 9 and repeat the process: 94 / 21

Step 5:
21 can be fit into 94 4 times, resulting in a remainder of 10.
Record the quotient 4 as the next digit in the result. 
Result so far: 2564.0
The remainder is 10 after subtracting 84 from 94.
Include the next digit (6) from the dividend after 10, then repeat: 106 / 21

Moving on to step 6:
106 divided by 21 is 5 with a remainder of 1.
Use 5 as the next digit of our solution. 
Result so far: 25645.0
If we take 105 away from 106, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 7:
The number 21 fits into 10 0 times, leaving a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 25645.0
Deduct 0 from 10 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 8:
The number 21 fits into 100 4 times, leaving a remainder of 16.
The next digit of our result is 4. 
Result so far: 25645.04
Deduct 84 from 100 and we're left with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Step 9:
21 goes into 160 7 times with a remainder of 13.
Put 7 as the next digit of the answer. 
Result so far: 25645.047
The remainder is 13 after subtracting 147 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Going ahead to step 10:
21 goes into 130 6 times with a remainder of 4.
Put 6 as the next digit of the answer. 
Result so far: 25645.0476
Deduct 126 from 130 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 11:
The number 21 fits into 40 1 times, leaving a remainder of 19.
Put 1 as the next digit of the answer. 
Result so far: 25645.04761
If we subtract 21 from 40, we get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Advancing to step 12:
21 goes into 190 9 times with a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 25645.047619
Subtract 189 from 190 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 13:
If we divide 10 by 21, we get 0 and a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 25645.047619
Deduct 0 from 10 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 14:
21 goes into 100 4 times with a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 25645.04761904
The remainder is 16 after subtracting 84 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

After the division, we end up with 25645.04761904 and a remainder of 1.6e-08.