994938 divided by 21 
The aim is to understand the frequency of 21 in 994938.

Step 1:
The number 21 fits into 9 0 times, leaving a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Take the next digit (9) from the dividend and append it to 9, then repeat: 99 / 21

Let's proceed to step 2:
When dividing 99 by 21, we get 4 with a remainder of 15.
The next digit of our result is 4. 
Result so far: 4.0
Deduct 84 from 99 and we're left with 15.
Include the next digit (4) from the dividend after 15, then repeat: 154 / 21

Let's proceed to step 3:
The number 21 fits into 154 7 times, leaving a remainder of 7.
The next digit of our result is 7. 
Result so far: 47.0
The remainder is 7 after subtracting 147 from 154.
Fetch the next digit (9) from the dividend, attach it to 7 and continue: 79 / 21

Step 4:
21 goes into 79 3 times with a remainder of 16.
The number 3 becomes the next digit in our result. 
Result so far: 473.0
Subtract 63 from 79 to get 16.
Include the next digit (3) from the dividend after 16, then repeat: 163 / 21

On to step 5:
The number 21 fits into 163 7 times, leaving a remainder of 16.
Write down 7 as next digit of the result. 
Result so far: 4737.0
Subtract 147 from 163 to get 16.
Bring next digit (8) of the dividend behind the 16 and repeat the process: 168 / 21

Moving on to step 6:
21 can be fit into 168 8 times, resulting in a remainder of 0.
Write down 8 as next digit of the result. 
Result so far: 47378.0
If we subtract 168 from 168, 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.

Advancing to step 7:
0 divided by 21 is 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 47378.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 8:
0 divided by 21 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 47378.0
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

In conclusion, the division gives 47378.0 with a balance of 0.0.