594146 divided by 21 
The aim is to understand the frequency of 21 in 594146.

Step 1:
21 goes into 5 0 times with a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Append the next digit (9) from the dividend to 5 and continue with: 59 / 21

Going ahead to step 2:
When dividing 59 by 21, we get 2 with a remainder of 17.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
The remainder is 17 after subtracting 42 from 59.
Fetch the next digit (4) from the dividend, attach it to 17 and continue: 174 / 21

Going ahead to step 3:
174 divided by 21 is 8 with a remainder of 6.
Write down 8 as next digit of the result. 
Result so far: 28.0
The remainder is 6 after subtracting 168 from 174.
Fetch the next digit (1) from the dividend, attach it to 6 and continue: 61 / 21

On to step 4:
If we divide 61 by 21, we get 2 and a remainder of 19.
Write down 2 as next digit of the result. 
Result so far: 282.0
If we take 42 away from 61, we end up with 19.
Grab the next digit (4) from the dividend, add it to 19, then carry on: 194 / 21

Advancing to step 5:
21 can be fit into 194 9 times, resulting in a remainder of 5.
The next digit of our result is 9. 
Result so far: 2829.0
The remainder is 5 after subtracting 189 from 194.
Bring next digit (6) of the dividend behind the 5 and repeat the process: 56 / 21

Let's proceed to step 6:
When dividing 56 by 21, we get 2 with a remainder of 14.
Record the quotient 2 as the next digit in the result. 
Result so far: 28292.0
Subtract 42 from 56 to get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Let's proceed to step 7:
21 can be fit into 140 6 times, resulting in a remainder of 14.
Use 6 as the next digit of our solution. 
Result so far: 28292.6
Subtract 126 from 140 to get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Moving on to step 8:
When dividing 140 by 21, we get 6 with a remainder of 14.
The next digit of our result is 6. 
Result so far: 28292.66
Subtracting 126 from 140 leaves us with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

After the division, we end up with 28292.66 and a remainder of 0.014.