363714 divided by 21 
The aim is to understand the frequency of 21 in 363714.

On to step 1:
21 can be fit into 3 0 times, resulting in a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Fetch the next digit (6) from the dividend, attach it to 3 and continue: 36 / 21

Going ahead to step 2:
36 divided by 21 is 1 with a remainder of 15.
The next digit of our result is 1. 
Result so far: 1.0
If we take 21 away from 36, we end up with 15.
Fetch the next digit (3) from the dividend, attach it to 15 and continue: 153 / 21

Let's proceed to step 3:
21 can be fit into 153 7 times, resulting in a remainder of 6.
The next digit of our result is 7. 
Result so far: 17.0
If we subtract 147 from 153, we get 6.
Grab the next digit (7) from the dividend, add it to 6, then carry on: 67 / 21

Step 4:
21 goes into 67 3 times with a remainder of 4.
Use 3 as the next digit of our solution. 
Result so far: 173.0
If we take 63 away from 67, we end up with 4.
Include the next digit (1) from the dividend after 4, then repeat: 41 / 21

Moving on to step 5:
When dividing 41 by 21, we get 1 with a remainder of 20.
Record the quotient 1 as the next digit in the result. 
Result so far: 1731.0
The remainder is 20 after subtracting 21 from 41.
Append the next digit (4) from the dividend to 20 and continue with: 204 / 21

Going ahead to step 6:
If we divide 204 by 21, we get 9 and a remainder of 15.
Write down 9 as next digit of the result. 
Result so far: 17319.0
Subtracting 189 from 204 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 7:
21 can be fit into 150 7 times, resulting in a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 17319.7
If we subtract 147 from 150, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 8:
30 divided by 21 is 1 with a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 17319.71
If we take 21 away from 30, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 9:
The number 21 fits into 90 4 times, leaving a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 17319.714
Subtract 84 from 90 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 10:
When dividing 60 by 21, we get 2 with a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 17319.7142
Subtracting 42 from 60 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Going ahead to step 11:
When dividing 180 by 21, we get 8 with a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 17319.71428
If we subtract 168 from 180, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 12:
If we divide 120 by 21, we get 5 and a remainder of 15.
The next digit of our result is 5. 
Result so far: 17319.714285
Deduct 105 from 120 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 13:
If we divide 150 by 21, we get 7 and a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 17319.7142857
The remainder is 3 after subtracting 147 from 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Advancing to step 14:
When dividing 30 by 21, we get 1 with a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 17319.71428571
Deduct 21 from 30 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

In conclusion, the division gives 17319.71428571 with a balance of 9e-09.