95541421 ÷ 21 
The aim is to understand the frequency of 21 in 95541421.

Let's proceed to step 1:
If we divide 9 by 21, we get 0 and a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Bring next digit (5) of the dividend behind the 9 and repeat the process: 95 / 21

Let's proceed to step 2:
21 goes into 95 4 times with a remainder of 11.
Use 4 as the next digit of our solution. 
Result so far: 4.0
If we subtract 84 from 95, we get 11.
Grab the next digit (5) from the dividend, add it to 11, then carry on: 115 / 21

Step 3:
115 divided by 21 is 5 with a remainder of 10.
Record the quotient 5 as the next digit in the result. 
Result so far: 45.0
Subtracting 105 from 115 leaves us with 10.
Fetch the next digit (4) from the dividend, attach it to 10 and continue: 104 / 21

Moving on to step 4:
The number 21 fits into 104 4 times, leaving a remainder of 20.
The next digit of our result is 4. 
Result so far: 454.0
Subtract 84 from 104 to get 20.
Take the next digit (1) from the dividend and append it to 20, then repeat: 201 / 21

Step 5:
21 can be fit into 201 9 times, resulting in a remainder of 12.
Write down 9 as next digit of the result. 
Result so far: 4549.0
Subtracting 189 from 201 leaves us with 12.
Append the next digit (4) from the dividend to 12 and continue with: 124 / 21

Moving on to step 6:
21 can be fit into 124 5 times, resulting in a remainder of 19.
The next digit of our result is 5. 
Result so far: 45495.0
If we subtract 105 from 124, we get 19.
Append the next digit (2) from the dividend to 19 and continue with: 192 / 21

Going ahead to step 7:
21 can be fit into 192 9 times, resulting in a remainder of 3.
Record the quotient 9 as the next digit in the result. 
Result so far: 454959.0
Deduct 189 from 192 and we're left with 3.
Grab the next digit (1) from the dividend, add it to 3, then carry on: 31 / 21

Advancing to step 8:
When dividing 31 by 21, we get 1 with a remainder of 10.
Use 1 as the next digit of our solution. 
Result so far: 4549591.0
Subtracting 21 from 31 leaves us 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.

Advancing to step 9:
100 divided by 21 is 4 with a remainder of 16.
The next digit of our result is 4. 
Result so far: 4549591.4
The remainder is 16 after subtracting 84 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Moving on to step 10:
When dividing 160 by 21, we get 7 with a remainder of 13.
The next digit of our result is 7. 
Result so far: 4549591.47
Subtract 147 from 160 to get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Let's proceed to step 11:
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: 4549591.476
Subtract 126 from 130 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 12:
When dividing 40 by 21, we get 1 with a remainder of 19.
Put 1 as the next digit of the answer. 
Result so far: 4549591.4761
Subtract 21 from 40 to get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Step 13:
The number 21 fits into 190 9 times, leaving a remainder of 1.
Record the quotient 9 as the next digit in the result. 
Result so far: 4549591.47619
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.

Let's proceed to step 14:
21 goes into 10 0 times with a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 4549591.47619
If we subtract 0 from 10, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 15:
21 goes into 100 4 times with a remainder of 16.
The number 4 becomes the next digit in our result. 
Result so far: 4549591.4761904
If we take 84 away from 100, we end up 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.

Going ahead to step 16:
When dividing 160 by 21, we get 7 with a remainder of 13.
Write down 7 as next digit of the result. 
Result so far: 4549591.47619047
Deduct 147 from 160 and we're left with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

After the division, we end up with 4549591.47619047 and a remainder of 1.3e-08.