21359223 divided by 721 
The aim is to understand the frequency of 721 in 21359223.

Advancing to step 1:
2 divided by 721 is 0 with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 721

Moving on to step 2:
21 divided by 721 is 0 with a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Bring next digit (3) of the dividend behind the 21 and repeat the process: 213 / 721

Let's proceed to step 3:
721 goes into 213 0 times with a remainder of 213.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 213 to get 213.
Fetch the next digit (5) from the dividend, attach it to 213 and continue: 2135 / 721

Step 4:
The number 721 fits into 2135 2 times, leaving a remainder of 693.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtracting 1442 from 2135 leaves us with 693.
Fetch the next digit (9) from the dividend, attach it to 693 and continue: 6939 / 721

Step 5:
721 can be fit into 6939 9 times, resulting in a remainder of 450.
The next digit of our result is 9. 
Result so far: 29.0
Subtract 6489 from 6939 to get 450.
Include the next digit (2) from the dividend after 450, then repeat: 4502 / 721

Let's proceed to step 6:
If we divide 4502 by 721, we get 6 and a remainder of 176.
Record the quotient 6 as the next digit in the result. 
Result so far: 296.0
Deduct 4326 from 4502 and we're left with 176.
Bring next digit (2) of the dividend behind the 176 and repeat the process: 1762 / 721

Moving on to step 7:
1762 divided by 721 is 2 with a remainder of 320.
The next digit of our result is 2. 
Result so far: 2962.0
Subtract 1442 from 1762 to get 320.
Fetch the next digit (3) from the dividend, attach it to 320 and continue: 3203 / 721

Moving on to step 8:
721 goes into 3203 4 times with a remainder of 319.
Record the quotient 4 as the next digit in the result. 
Result so far: 29624.0
Subtracting 2884 from 3203 leaves us with 319.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3190, and continue the process.

Going ahead to step 9:
3190 divided by 721 is 4 with a remainder of 306.
The next digit of our result is 4. 
Result so far: 29624.4
Subtract 2884 from 3190 to get 306.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3060, and continue the process.

Going ahead to step 10:
The number 721 fits into 3060 4 times, leaving a remainder of 176.
The next digit of our result is 4. 
Result so far: 29624.44
The remainder is 176 after subtracting 2884 from 3060.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1760, and continue the process.

In conclusion, the division gives 29624.44 with a balance of 0.176.