We divide 774171 by 21
The aim is to understand the frequency of 21 in 774171.

Going ahead to 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
The remainder is 7 after subtracting 0 from 7.
Bring next digit (7) of the dividend behind the 7 and repeat the process: 77 / 21

Advancing to step 2:
21 can be fit into 77 3 times, resulting in a remainder of 14.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
If we subtract 63 from 77, we get 14.
Fetch the next digit (4) from the dividend, attach it to 14 and continue: 144 / 21

Step 3:
When dividing 144 by 21, we get 6 with a remainder of 18.
Put 6 as the next digit of the answer. 
Result so far: 36.0
Subtracting 126 from 144 leaves us with 18.
Fetch the next digit (1) from the dividend, attach it to 18 and continue: 181 / 21

Step 4:
181 divided by 21 is 8 with a remainder of 13.
Put 8 as the next digit of the answer. 
Result so far: 368.0
The remainder is 13 after subtracting 168 from 181.
Take the next digit (7) from the dividend and append it to 13, then repeat: 137 / 21

Moving on to step 5:
21 can be fit into 137 6 times, resulting in a remainder of 11.
The next digit of our result is 6. 
Result so far: 3686.0
Deduct 126 from 137 and we're left with 11.
Include the next digit (1) from the dividend after 11, then repeat: 111 / 21

Advancing to step 6:
The number 21 fits into 111 5 times, leaving a remainder of 6.
Put 5 as the next digit of the answer. 
Result so far: 36865.0
If we take 105 away from 111, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 7:
The number 21 fits into 60 2 times, leaving a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 36865.2
If we subtract 42 from 60, we get 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 8:
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: 36865.28
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.

Advancing to step 9:
If we divide 120 by 21, we get 5 and a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 36865.285
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.

Going ahead to step 10:
When dividing 150 by 21, we get 7 with a remainder of 3.
The next digit of our result is 7. 
Result so far: 36865.2857
Subtract 147 from 150 to 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.

Going ahead to step 11:
30 divided by 21 is 1 with a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 36865.28571
If we subtract 21 from 30, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 12:
21 goes into 90 4 times with a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 36865.285714
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.

Let's proceed to step 13:
When dividing 60 by 21, we get 2 with a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 36865.2857142
The remainder is 18 after subtracting 42 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Step 14:
21 can be fit into 180 8 times, resulting in a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 36865.28571428
The remainder is 12 after subtracting 168 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

In conclusion, the division gives 36865.28571428 with a balance of 1.2e-08.