We look at the division of 21591953 by 554 
The aim is to understand the frequency of 554 in 21591953.

Step 1:
The number 554 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.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 554

Step 2:
21 divided by 554 is 0 with a remainder of 21.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 21 to get 21.
Bring next digit (5) of the dividend behind the 21 and repeat the process: 215 / 554

Moving on to step 3:
215 divided by 554 is 0 with a remainder of 215.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 215 leaves us with 215.
Bring next digit (9) of the dividend behind the 215 and repeat the process: 2159 / 554

Going ahead to step 4:
If we divide 2159 by 554, we get 3 and a remainder of 497.
The next digit of our result is 3. 
Result so far: 3.0
Deduct 1662 from 2159 and we're left with 497.
Fetch the next digit (1) from the dividend, attach it to 497 and continue: 4971 / 554

Advancing to step 5:
4971 divided by 554 is 8 with a remainder of 539.
Record the quotient 8 as the next digit in the result. 
Result so far: 38.0
Subtract 4432 from 4971 to get 539.
Append the next digit (9) from the dividend to 539 and continue with: 5399 / 554

On to step 6:
554 goes into 5399 9 times with a remainder of 413.
Record the quotient 9 as the next digit in the result. 
Result so far: 389.0
If we subtract 4986 from 5399, we get 413.
Include the next digit (5) from the dividend after 413, then repeat: 4135 / 554

On to step 7:
554 can be fit into 4135 7 times, resulting in a remainder of 257.
The next digit of our result is 7. 
Result so far: 3897.0
Subtracting 3878 from 4135 leaves us with 257.
Fetch the next digit (3) from the dividend, attach it to 257 and continue: 2573 / 554

Let's proceed to step 8:
If we divide 2573 by 554, we get 4 and a remainder of 357.
The next digit of our result is 4. 
Result so far: 38974.0
Deduct 2216 from 2573 and we're left with 357.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3570, and continue the process.

Moving on to step 9:
3570 divided by 554 is 6 with a remainder of 246.
The next digit of our result is 6. 
Result so far: 38974.6
If we take 3324 away from 3570, we end up with 246.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2460, and continue the process.

Advancing to step 10:
The number 554 fits into 2460 4 times, leaving a remainder of 244.
Record the quotient 4 as the next digit in the result. 
Result so far: 38974.64
If we take 2216 away from 2460, we end up with 244.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2440, and continue the process.

On to step 11:
2440 divided by 554 is 4 with a remainder of 224.
The number 4 becomes the next digit in our result. 
Result so far: 38974.644
If we take 2216 away from 2440, we end up with 224.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2240, and continue the process.

The final outcome is 38974.644, with a leftover of 0.0224.