21201406 ÷ 525 
The aim is to understand the frequency of 525 in 21201406.

Advancing to step 1:
The number 525 fits into 2 0 times, leaving a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 525

Step 2:
525 can be fit into 21 0 times, resulting in a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 21 and we're left with 21.
Append the next digit (2) from the dividend to 21 and continue with: 212 / 525

Step 3:
525 can be fit into 212 0 times, resulting in a remainder of 212.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 212 to get 212.
Grab the next digit (0) from the dividend, add it to 212, then carry on: 2120 / 525

Going ahead to step 4:
525 goes into 2120 4 times with a remainder of 20.
Put 4 as the next digit of the answer. 
Result so far: 4.0
If we take 2100 away from 2120, we end up with 20.
Bring next digit (1) of the dividend behind the 20 and repeat the process: 201 / 525

On to step 5:
525 goes into 201 0 times with a remainder of 201.
The next digit of our result is 0. 
Result so far: 40.0
If we subtract 0 from 201, we get 201.
Fetch the next digit (4) from the dividend, attach it to 201 and continue: 2014 / 525

Let's proceed to step 6:
When dividing 2014 by 525, we get 3 with a remainder of 439.
The next digit of our result is 3. 
Result so far: 403.0
The remainder is 439 after subtracting 1575 from 2014.
Fetch the next digit (0) from the dividend, attach it to 439 and continue: 4390 / 525

Moving on to step 7:
If we divide 4390 by 525, we get 8 and a remainder of 190.
Record the quotient 8 as the next digit in the result. 
Result so far: 4038.0
If we subtract 4200 from 4390, we get 190.
Grab the next digit (6) from the dividend, add it to 190, then carry on: 1906 / 525

Step 8:
The number 525 fits into 1906 3 times, leaving a remainder of 331.
Write down 3 as next digit of the result. 
Result so far: 40383.0
Deduct 1575 from 1906 and we're left with 331.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3310, and continue the process.

Let's proceed to step 9:
525 goes into 3310 6 times with a remainder of 160.
Use 6 as the next digit of our solution. 
Result so far: 40383.6
If we take 3150 away from 3310, we end up with 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

On to step 10:
525 goes into 1600 3 times with a remainder of 25.
Use 3 as the next digit of our solution. 
Result so far: 40383.63
Subtract 1575 from 1600 to get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

On to step 11:
The number 525 fits into 250 0 times, leaving a remainder of 250.
Use 0 as the next digit of our solution. 
Result so far: 40383.63
Subtract 0 from 250 to get 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2500, and continue the process.

Let's proceed to step 12:
When dividing 2500 by 525, we get 4 with a remainder of 400.
Record the quotient 4 as the next digit in the result. 
Result so far: 40383.6304
Subtract 2100 from 2500 to get 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Let's proceed to step 13:
The number 525 fits into 4000 7 times, leaving a remainder of 325.
Write down 7 as next digit of the result. 
Result so far: 40383.63047
Subtract 3675 from 4000 to get 325.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3250, and continue the process.

On to step 14:
The number 525 fits into 3250 6 times, leaving a remainder of 100.
Put 6 as the next digit of the answer. 
Result so far: 40383.630476
Subtracting 3150 from 3250 leaves us with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Step 15:
1000 divided by 525 is 1 with a remainder of 475.
The number 1 becomes the next digit in our result. 
Result so far: 40383.6304761
Subtract 525 from 1000 to get 475.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4750, and continue the process.

Advancing to step 16:
525 can be fit into 4750 9 times, resulting in a remainder of 25.
Record the quotient 9 as the next digit in the result. 
Result so far: 40383.63047619
The remainder is 25 after subtracting 4725 from 4750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

In conclusion, the division gives 40383.63047619 with a balance of 2.5e-08.