21873015 ÷ 507 
The aim is to understand the frequency of 507 in 21873015.

Going ahead to step 1:
The number 507 fits into 2 0 times, leaving a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 507

Step 2:
When dividing 21 by 507, we get 0 with a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 21 leaves us with 21.
Include the next digit (8) from the dividend after 21, then repeat: 218 / 507

On to step 3:
218 divided by 507 is 0 with a remainder of 218.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 218 after subtracting 0 from 218.
Take the next digit (7) from the dividend and append it to 218, then repeat: 2187 / 507

Moving on to step 4:
507 can be fit into 2187 4 times, resulting in a remainder of 159.
Write down 4 as next digit of the result. 
Result so far: 4.0
Deduct 2028 from 2187 and we're left with 159.
Bring next digit (3) of the dividend behind the 159 and repeat the process: 1593 / 507

Moving on to step 5:
507 can be fit into 1593 3 times, resulting in a remainder of 72.
The next digit of our result is 3. 
Result so far: 43.0
If we subtract 1521 from 1593, we get 72.
Take the next digit (0) from the dividend and append it to 72, then repeat: 720 / 507

On to step 6:
507 can be fit into 720 1 times, resulting in a remainder of 213.
The next digit of our result is 1. 
Result so far: 431.0
If we subtract 507 from 720, we get 213.
Fetch the next digit (1) from the dividend, attach it to 213 and continue: 2131 / 507

Step 7:
2131 divided by 507 is 4 with a remainder of 103.
Record the quotient 4 as the next digit in the result. 
Result so far: 4314.0
Subtract 2028 from 2131 to get 103.
Fetch the next digit (5) from the dividend, attach it to 103 and continue: 1035 / 507

Step 8:
507 can be fit into 1035 2 times, resulting in a remainder of 21.
Use 2 as the next digit of our solution. 
Result so far: 43142.0
The remainder is 21 after subtracting 1014 from 1035.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Moving on to step 9:
210 divided by 507 is 0 with a remainder of 210.
Record the quotient 0 as the next digit in the result. 
Result so far: 43142.0
Subtract 0 from 210 to get 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2100, and continue the process.

On to step 10:
When dividing 2100 by 507, we get 4 with a remainder of 72.
Record the quotient 4 as the next digit in the result. 
Result so far: 43142.04
Subtracting 2028 from 2100 leaves us with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Let's proceed to step 11:
The number 507 fits into 720 1 times, leaving a remainder of 213.
Write down 1 as next digit of the result. 
Result so far: 43142.041
The remainder is 213 after subtracting 507 from 720.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2130, and continue the process.

Let's proceed to step 12:
507 goes into 2130 4 times with a remainder of 102.
Record the quotient 4 as the next digit in the result. 
Result so far: 43142.0414
Deduct 2028 from 2130 and we're left with 102.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1020, and continue the process.

On to step 13:
If we divide 1020 by 507, we get 2 and a remainder of 6.
Write down 2 as next digit of the result. 
Result so far: 43142.04142
Deduct 1014 from 1020 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 14:
60 divided by 507 is 0 with a remainder of 60.
Write down 0 as next digit of the result. 
Result so far: 43142.04142
If we subtract 0 from 60, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 15:
If we divide 600 by 507, we get 1 and a remainder of 93.
Put 1 as the next digit of the answer. 
Result so far: 43142.0414201
If we take 507 away from 600, we end up with 93.
Since there are no more digits in the dividend, we add a zero to the remainder making it 930, and continue the process.

On to step 16:
507 can be fit into 930 1 times, resulting in a remainder of 423.
The next digit of our result is 1. 
Result so far: 43142.04142011
Deduct 507 from 930 and we're left with 423.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4230, and continue the process.

The quotient of the division is 43142.04142011, and the remainder is 4.23e-07.