We divide 19821229 by 21
The aim is to understand the frequency of 21 in 19821229.

Moving on to step 1:
The number 21 fits into 1 0 times, leaving a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Bring next digit (9) of the dividend behind the 1 and repeat the process: 19 / 21

Step 2:
21 goes into 19 0 times with a remainder of 19.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 19, we get 19.
Bring next digit (8) of the dividend behind the 19 and repeat the process: 198 / 21

Going ahead to step 3:
When dividing 198 by 21, we get 9 with a remainder of 9.
Put 9 as the next digit of the answer. 
Result so far: 9.0
If we subtract 189 from 198, we get 9.
Bring next digit (2) of the dividend behind the 9 and repeat the process: 92 / 21

Step 4:
The number 21 fits into 92 4 times, leaving a remainder of 8.
The next digit of our result is 4. 
Result so far: 94.0
Subtracting 84 from 92 leaves us with 8.
Take the next digit (1) from the dividend and append it to 8, then repeat: 81 / 21

Advancing to step 5:
When dividing 81 by 21, we get 3 with a remainder of 18.
Write down 3 as next digit of the result. 
Result so far: 943.0
Subtract 63 from 81 to get 18.
Take the next digit (2) from the dividend and append it to 18, then repeat: 182 / 21

Moving on to step 6:
182 divided by 21 is 8 with a remainder of 14.
Record the quotient 8 as the next digit in the result. 
Result so far: 9438.0
Deduct 168 from 182 and we're left with 14.
Take the next digit (2) from the dividend and append it to 14, then repeat: 142 / 21

Let's proceed to step 7:
21 can be fit into 142 6 times, resulting in a remainder of 16.
Put 6 as the next digit of the answer. 
Result so far: 94386.0
The remainder is 16 after subtracting 126 from 142.
Fetch the next digit (9) from the dividend, attach it to 16 and continue: 169 / 21

Moving on to step 8:
169 divided by 21 is 8 with a remainder of 1.
Record the quotient 8 as the next digit in the result. 
Result so far: 943868.0
The remainder is 1 after subtracting 168 from 169.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 9:
If we divide 10 by 21, we get 0 and a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 943868.0
Deduct 0 from 10 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 10:
21 can be fit into 100 4 times, resulting in a remainder of 16.
The number 4 becomes the next digit in our result. 
Result so far: 943868.04
If we subtract 84 from 100, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Let's proceed to step 11:
If we divide 160 by 21, we get 7 and a remainder of 13.
The next digit of our result is 7. 
Result so far: 943868.047
The remainder is 13 after subtracting 147 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Going ahead to step 12:
21 can be fit into 130 6 times, resulting in a remainder of 4.
Use 6 as the next digit of our solution. 
Result so far: 943868.0476
If we take 126 away from 130, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 13:
The number 21 fits into 40 1 times, leaving a remainder of 19.
The next digit of our result is 1. 
Result so far: 943868.04761
Deduct 21 from 40 and we're left with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Going ahead to step 14:
21 can be fit into 190 9 times, resulting in a remainder of 1.
Use 9 as the next digit of our solution. 
Result so far: 943868.047619
The remainder is 1 after subtracting 189 from 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 15:
10 divided by 21 is 0 with a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 943868.047619
If we take 0 away from 10, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 16:
The number 21 fits into 100 4 times, leaving a remainder of 16.
The number 4 becomes the next digit in our result. 
Result so far: 943868.04761904
Subtracting 84 from 100 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

The final outcome is 943868.04761904, with a leftover of 1.6e-08.