241671 divided by 21 
The aim is to understand the frequency of 21 in 241671.

Going ahead to step 1:
2 divided by 21 is 0 with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Append the next digit (4) from the dividend to 2 and continue with: 24 / 21

On to step 2:
When dividing 24 by 21, we get 1 with a remainder of 3.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we subtract 21 from 24, we get 3.
Grab the next digit (1) from the dividend, add it to 3, then carry on: 31 / 21

Step 3:
If we divide 31 by 21, we get 1 and a remainder of 10.
Put 1 as the next digit of the answer. 
Result so far: 11.0
The remainder is 10 after subtracting 21 from 31.
Bring next digit (6) of the dividend behind the 10 and repeat the process: 106 / 21

Going ahead to step 4:
106 divided by 21 is 5 with a remainder of 1.
Write down 5 as next digit of the result. 
Result so far: 115.0
Subtracting 105 from 106 leaves us with 1.
Append the next digit (7) from the dividend to 1 and continue with: 17 / 21

Step 5:
If we divide 17 by 21, we get 0 and a remainder of 17.
Put 0 as the next digit of the answer. 
Result so far: 1150.0
Subtracting 0 from 17 leaves us with 17.
Append the next digit (1) from the dividend to 17 and continue with: 171 / 21

Going ahead to step 6:
171 divided by 21 is 8 with a remainder of 3.
The next digit of our result is 8. 
Result so far: 11508.0
Deduct 168 from 171 and we're left with 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 7:
21 can be fit into 30 1 times, resulting in a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 11508.1
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 8:
21 goes into 90 4 times with a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 11508.14
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.

Step 9:
When dividing 60 by 21, we get 2 with a remainder of 18.
The next digit of our result is 2. 
Result so far: 11508.142
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.

On to step 10:
The number 21 fits into 180 8 times, leaving a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 11508.1428
If we take 168 away from 180, we end up with 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 11:
If we divide 120 by 21, we get 5 and a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 11508.14285
If we take 105 away from 120, we end up 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.

On to step 12:
If we divide 150 by 21, we get 7 and a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 11508.142857
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.

Moving on to step 13:
21 can be fit into 30 1 times, resulting in a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 11508.1428571
Subtracting 21 from 30 leaves us 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 14:
21 goes into 90 4 times with a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 11508.14285714
If we take 84 away from 90, 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.

After the division, we end up with 11508.14285714 and a remainder of 6e-09.