We're dividing 72546389 by 21 
We're looking to find how many times 21 goes into 72546389.

Step 1:
7 divided by 21 is 0 with a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Include the next digit (2) from the dividend after 7, then repeat: 72 / 21

Moving on to step 2:
The number 21 fits into 72 3 times, leaving a remainder of 9.
The next digit of our result is 3. 
Result so far: 3.0
Subtracting 63 from 72 leaves us with 9.
Fetch the next digit (5) from the dividend, attach it to 9 and continue: 95 / 21

Advancing to step 3:
95 divided by 21 is 4 with a remainder of 11.
Use 4 as the next digit of our solution. 
Result so far: 34.0
Deduct 84 from 95 and we're left with 11.
Include the next digit (4) from the dividend after 11, then repeat: 114 / 21

Let's proceed to step 4:
21 can be fit into 114 5 times, resulting in a remainder of 9.
Use 5 as the next digit of our solution. 
Result so far: 345.0
Subtract 105 from 114 to get 9.
Include the next digit (6) from the dividend after 9, then repeat: 96 / 21

Step 5:
The number 21 fits into 96 4 times, leaving a remainder of 12.
Record the quotient 4 as the next digit in the result. 
Result so far: 3454.0
If we subtract 84 from 96, we get 12.
Fetch the next digit (3) from the dividend, attach it to 12 and continue: 123 / 21

Let's proceed to step 6:
The number 21 fits into 123 5 times, leaving a remainder of 18.
The next digit of our result is 5. 
Result so far: 34545.0
If we subtract 105 from 123, we get 18.
Include the next digit (8) from the dividend after 18, then repeat: 188 / 21

Going ahead to step 7:
21 goes into 188 8 times with a remainder of 20.
Write down 8 as next digit of the result. 
Result so far: 345458.0
Deduct 168 from 188 and we're left with 20.
Take the next digit (9) from the dividend and append it to 20, then repeat: 209 / 21

Moving on to step 8:
21 can be fit into 209 9 times, resulting in a remainder of 20.
Record the quotient 9 as the next digit in the result. 
Result so far: 3454589.0
Deduct 189 from 209 and we're left 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 9:
200 divided by 21 is 9 with a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 3454589.9
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 10:
The number 21 fits into 110 5 times, leaving a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 3454589.95
The remainder is 5 after subtracting 105 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 11:
21 can be fit into 50 2 times, resulting in a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 3454589.952
If we subtract 42 from 50, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 12:
If we divide 80 by 21, we get 3 and a remainder of 17.
The next digit of our result is 3. 
Result so far: 3454589.9523
The remainder is 17 after subtracting 63 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Going ahead to step 13:
When dividing 170 by 21, we get 8 with a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 3454589.95238
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.

Going ahead to step 14:
20 divided by 21 is 0 with a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 3454589.95238
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.

Moving on to step 15:
200 divided by 21 is 9 with a remainder of 11.
The next digit of our result is 9. 
Result so far: 3454589.9523809
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.

Let's proceed to step 16:
If we divide 110 by 21, we get 5 and a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 3454589.95238095
Deduct 105 from 110 and we're left 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.

Our division results in 3454589.95238095 with a remaining 5e-09.