21369086 divided by 39 
The aim is to understand the frequency of 39 in 21369086.

Advancing to step 1:
When dividing 2 by 39, we get 0 with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 39

Step 2:
If we divide 21 by 39, we get 0 and a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 21 after subtracting 0 from 21.
Append the next digit (3) from the dividend to 21 and continue with: 213 / 39

Going ahead to step 3:
If we divide 213 by 39, we get 5 and a remainder of 18.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
The remainder is 18 after subtracting 195 from 213.
Fetch the next digit (6) from the dividend, attach it to 18 and continue: 186 / 39

On to step 4:
39 can be fit into 186 4 times, resulting in a remainder of 30.
Record the quotient 4 as the next digit in the result. 
Result so far: 54.0
Deduct 156 from 186 and we're left with 30.
Append the next digit (9) from the dividend to 30 and continue with: 309 / 39

On to step 5:
When dividing 309 by 39, we get 7 with a remainder of 36.
The number 7 becomes the next digit in our result. 
Result so far: 547.0
If we subtract 273 from 309, we get 36.
Fetch the next digit (0) from the dividend, attach it to 36 and continue: 360 / 39

Moving on to step 6:
If we divide 360 by 39, we get 9 and a remainder of 9.
The next digit of our result is 9. 
Result so far: 5479.0
The remainder is 9 after subtracting 351 from 360.
Include the next digit (8) from the dividend after 9, then repeat: 98 / 39

Going ahead to step 7:
When dividing 98 by 39, we get 2 with a remainder of 20.
The next digit of our result is 2. 
Result so far: 54792.0
Subtracting 78 from 98 leaves us with 20.
Take the next digit (6) from the dividend and append it to 20, then repeat: 206 / 39

Going ahead to step 8:
206 divided by 39 is 5 with a remainder of 11.
The number 5 becomes the next digit in our result. 
Result so far: 547925.0
Subtract 195 from 206 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 9:
39 can be fit into 110 2 times, resulting in a remainder of 32.
Put 2 as the next digit of the answer. 
Result so far: 547925.2
If we subtract 78 from 110, we get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Advancing to step 10:
39 goes into 320 8 times with a remainder of 8.
Record the quotient 8 as the next digit in the result. 
Result so far: 547925.28
Deduct 312 from 320 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 11:
39 goes into 80 2 times with a remainder of 2.
Write down 2 as next digit of the result. 
Result so far: 547925.282
The remainder is 2 after subtracting 78 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 12:
39 can be fit into 20 0 times, resulting in a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 547925.282
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 13:
When dividing 200 by 39, we get 5 with a remainder of 5.
The next digit of our result is 5. 
Result so far: 547925.28205
The remainder is 5 after subtracting 195 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 14:
The number 39 fits into 50 1 times, leaving a remainder of 11.
Use 1 as the next digit of our solution. 
Result so far: 547925.282051
Subtract 39 from 50 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 15:
110 divided by 39 is 2 with a remainder of 32.
Put 2 as the next digit of the answer. 
Result so far: 547925.2820512
If we subtract 78 from 110, we get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Moving on to step 16:
320 divided by 39 is 8 with a remainder of 8.
Record the quotient 8 as the next digit in the result. 
Result so far: 547925.28205128
If we take 312 away from 320, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

In conclusion, the division gives 547925.28205128 with a balance of 8e-09.