We look at the division of 89112246 by 21 
The aim is to understand the frequency of 21 in 89112246.

Step 1:
21 goes into 8 0 times with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Bring next digit (9) of the dividend behind the 8 and repeat the process: 89 / 21

On to step 2:
21 goes into 89 4 times with a remainder of 5.
Use 4 as the next digit of our solution. 
Result so far: 4.0
The remainder is 5 after subtracting 84 from 89.
Grab the next digit (1) from the dividend, add it to 5, then carry on: 51 / 21

Let's proceed to step 3:
51 divided by 21 is 2 with a remainder of 9.
The next digit of our result is 2. 
Result so far: 42.0
Deduct 42 from 51 and we're left with 9.
Bring next digit (1) of the dividend behind the 9 and repeat the process: 91 / 21

Let's proceed to step 4:
21 can be fit into 91 4 times, resulting in a remainder of 7.
Write down 4 as next digit of the result. 
Result so far: 424.0
If we take 84 away from 91, we end up with 7.
Include the next digit (2) from the dividend after 7, then repeat: 72 / 21

Advancing to step 5:
21 can be fit into 72 3 times, resulting in a remainder of 9.
Use 3 as the next digit of our solution. 
Result so far: 4243.0
The remainder is 9 after subtracting 63 from 72.
Fetch the next digit (2) from the dividend, attach it to 9 and continue: 92 / 21

Let's proceed to step 6:
21 goes into 92 4 times with a remainder of 8.
Put 4 as the next digit of the answer. 
Result so far: 42434.0
If we subtract 84 from 92, we get 8.
Include the next digit (4) from the dividend after 8, then repeat: 84 / 21

Step 7:
When dividing 84 by 21, we get 4 with a remainder of 0.
The number 4 becomes the next digit in our result. 
Result so far: 424344.0
Subtract 84 from 84 to get 0.
Fetch the next digit (6) from the dividend, attach it to 0 and continue: 6 / 21

Advancing to step 8:
If we divide 6 by 21, we get 0 and a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 4243440.0
If we subtract 0 from 6, we 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.

Moving on to step 9:
The number 21 fits into 60 2 times, leaving a remainder of 18.
Write down 2 as next digit of the result. 
Result so far: 4243440.2
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.

Advancing to step 10:
When dividing 180 by 21, we get 8 with a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 4243440.28
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.
The next digit of our result is 5. 
Result so far: 4243440.285
Subtract 105 from 120 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Let's proceed to step 12:
150 divided by 21 is 7 with a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 4243440.2857
Subtract 147 from 150 to 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.

On to step 13:
21 can be fit into 30 1 times, resulting in a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 4243440.28571
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.

Advancing to step 14:
The number 21 fits into 90 4 times, leaving a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 4243440.285714
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.

Moving on to step 15:
21 can be fit into 60 2 times, resulting in a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 4243440.2857142
Subtract 42 from 60 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.

Moving on to step 16:
21 goes into 180 8 times with a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 4243440.28571428
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.

After the division, we end up with 4243440.28571428 and a remainder of 1.2e-08.