21174139 divided by 784 
The aim is to understand the frequency of 784 in 21174139.

Advancing to step 1:
When dividing 2 by 784, we get 0 with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 784

Going ahead to step 2:
784 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
Subtracting 0 from 21 leaves us with 21.
Include the next digit (1) from the dividend after 21, then repeat: 211 / 784

Step 3:
784 can be fit into 211 0 times, resulting in a remainder of 211.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 211, we get 211.
Bring next digit (7) of the dividend behind the 211 and repeat the process: 2117 / 784

Going ahead to step 4:
The number 784 fits into 2117 2 times, leaving a remainder of 549.
Use 2 as the next digit of our solution. 
Result so far: 2.0
The remainder is 549 after subtracting 1568 from 2117.
Include the next digit (4) from the dividend after 549, then repeat: 5494 / 784

Going ahead to step 5:
The number 784 fits into 5494 7 times, leaving a remainder of 6.
The next digit of our result is 7. 
Result so far: 27.0
If we take 5488 away from 5494, we end up with 6.
Append the next digit (1) from the dividend to 6 and continue with: 61 / 784

Going ahead to step 6:
784 can be fit into 61 0 times, resulting in a remainder of 61.
Write down 0 as next digit of the result. 
Result so far: 270.0
The remainder is 61 after subtracting 0 from 61.
Bring next digit (3) of the dividend behind the 61 and repeat the process: 613 / 784

Going ahead to step 7:
784 goes into 613 0 times with a remainder of 613.
The next digit of our result is 0. 
Result so far: 2700.0
If we subtract 0 from 613, we get 613.
Grab the next digit (9) from the dividend, add it to 613, then carry on: 6139 / 784

Moving on to step 8:
The number 784 fits into 6139 7 times, leaving a remainder of 651.
Record the quotient 7 as the next digit in the result. 
Result so far: 27007.0
Deduct 5488 from 6139 and we're left with 651.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6510, and continue the process.

Step 9:
When dividing 6510 by 784, we get 8 with a remainder of 238.
Use 8 as the next digit of our solution. 
Result so far: 27007.8
Subtract 6272 from 6510 to get 238.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2380, and continue the process.

Let's proceed to step 10:
When dividing 2380 by 784, we get 3 with a remainder of 28.
Write down 3 as next digit of the result. 
Result so far: 27007.83
Deduct 2352 from 2380 and we're left with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

On to step 11:
784 can be fit into 280 0 times, resulting in a remainder of 280.
The number 0 becomes the next digit in our result. 
Result so far: 27007.83
The remainder is 280 after subtracting 0 from 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

On to step 12:
The number 784 fits into 2800 3 times, leaving a remainder of 448.
Record the quotient 3 as the next digit in the result. 
Result so far: 27007.8303
The remainder is 448 after subtracting 2352 from 2800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4480, and continue the process.

Going ahead to step 13:
4480 divided by 784 is 5 with a remainder of 560.
The number 5 becomes the next digit in our result. 
Result so far: 27007.83035
Subtracting 3920 from 4480 leaves us with 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5600, and continue the process.

On to step 14:
784 goes into 5600 7 times with a remainder of 112.
Write down 7 as next digit of the result. 
Result so far: 27007.830357
If we subtract 5488 from 5600, we get 112.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1120, and continue the process.

Moving on to step 15:
If we divide 1120 by 784, we get 1 and a remainder of 336.
Put 1 as the next digit of the answer. 
Result so far: 27007.8303571
Subtracting 784 from 1120 leaves us with 336.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3360, and continue the process.

Moving on to step 16:
When dividing 3360 by 784, we get 4 with a remainder of 224.
Use 4 as the next digit of our solution. 
Result so far: 27007.83035714
The remainder is 224 after subtracting 3136 from 3360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2240, and continue the process.

Our division results in 27007.83035714 with a remaining 2.24e-07.