Let's divide 365085 by 21
The aim is to understand the frequency of 21 in 365085.

Moving on to step 1:
The number 21 fits into 3 0 times, leaving a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Fetch the next digit (6) from the dividend, attach it to 3 and continue: 36 / 21

Going ahead to step 2:
21 can be fit into 36 1 times, resulting in a remainder of 15.
The next digit of our result is 1. 
Result so far: 1.0
The remainder is 15 after subtracting 21 from 36.
Bring next digit (5) of the dividend behind the 15 and repeat the process: 155 / 21

Going ahead to step 3:
When dividing 155 by 21, we get 7 with a remainder of 8.
Record the quotient 7 as the next digit in the result. 
Result so far: 17.0
Subtract 147 from 155 to get 8.
Take the next digit (0) from the dividend and append it to 8, then repeat: 80 / 21

Advancing to step 4:
80 divided by 21 is 3 with a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 173.0
The remainder is 17 after subtracting 63 from 80.
Grab the next digit (8) from the dividend, add it to 17, then carry on: 178 / 21

Let's proceed to step 5:
The number 21 fits into 178 8 times, leaving a remainder of 10.
Record the quotient 8 as the next digit in the result. 
Result so far: 1738.0
If we subtract 168 from 178, we get 10.
Include the next digit (5) from the dividend after 10, then repeat: 105 / 21

Step 6:
21 can be fit into 105 5 times, resulting in a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 17385.0
Subtract 105 from 105 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 7:
When dividing 0 by 21, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 17385.0
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 8:
The number 21 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 17385.0
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 17385.0 and a remainder of 0.0.