We divide 606897 by 21
The aim is to understand the frequency of 21 in 606897.

Going ahead to step 1:
21 goes into 6 0 times with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Append the next digit (0) from the dividend to 6 and continue with: 60 / 21

Let's proceed to step 2:
60 divided by 21 is 2 with a remainder of 18.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtract 42 from 60 to get 18.
Bring next digit (6) of the dividend behind the 18 and repeat the process: 186 / 21

Going ahead to step 3:
21 can be fit into 186 8 times, resulting in a remainder of 18.
Use 8 as the next digit of our solution. 
Result so far: 28.0
The remainder is 18 after subtracting 168 from 186.
Include the next digit (8) from the dividend after 18, then repeat: 188 / 21

Step 4:
21 goes into 188 8 times with a remainder of 20.
Record the quotient 8 as the next digit in the result. 
Result so far: 288.0
Subtracting 168 from 188 leaves us with 20.
Bring next digit (9) of the dividend behind the 20 and repeat the process: 209 / 21

Advancing to step 5:
When dividing 209 by 21, we get 9 with a remainder of 20.
Use 9 as the next digit of our solution. 
Result so far: 2889.0
The remainder is 20 after subtracting 189 from 209.
Bring next digit (7) of the dividend behind the 20 and repeat the process: 207 / 21

Step 6:
207 divided by 21 is 9 with a remainder of 18.
The next digit of our result is 9. 
Result so far: 28899.0
Subtract 189 from 207 to 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 7:
180 divided by 21 is 8 with a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 28899.8
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.

Advancing to step 8:
If we divide 120 by 21, we get 5 and a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 28899.85
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.

Step 9:
The number 21 fits into 150 7 times, leaving a remainder of 3.
The next digit of our result is 7. 
Result so far: 28899.857
If we take 147 away from 150, we end up 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.

Advancing to step 10:
If we divide 30 by 21, we get 1 and a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 28899.8571
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.

Moving on to step 11:
If we divide 90 by 21, we get 4 and a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 28899.85714
Deduct 84 from 90 and we're left 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.

Moving on to step 12:
60 divided by 21 is 2 with a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 28899.857142
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 13:
When dividing 180 by 21, we get 8 with a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 28899.8571428
Subtract 168 from 180 to 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 14:
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: 28899.85714285
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.

Our division results in 28899.85714285 with a remaining 1.5e-08.