We're dividing 23521001 by 873 
The aim is to understand the frequency of 873 in 23521001.

Advancing to step 1:
The number 873 fits into 2 0 times, leaving a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Fetch the next digit (3) from the dividend, attach it to 2 and continue: 23 / 873

Moving on to step 2:
873 can be fit into 23 0 times, resulting in a remainder of 23.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 23, we end up with 23.
Bring next digit (5) of the dividend behind the 23 and repeat the process: 235 / 873

Advancing to step 3:
When dividing 235 by 873, we get 0 with a remainder of 235.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 235 leaves us with 235.
Take the next digit (2) from the dividend and append it to 235, then repeat: 2352 / 873

On to step 4:
If we divide 2352 by 873, we get 2 and a remainder of 606.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtract 1746 from 2352 to get 606.
Grab the next digit (1) from the dividend, add it to 606, then carry on: 6061 / 873

Going ahead to step 5:
6061 divided by 873 is 6 with a remainder of 823.
The next digit of our result is 6. 
Result so far: 26.0
The remainder is 823 after subtracting 5238 from 6061.
Bring next digit (0) of the dividend behind the 823 and repeat the process: 8230 / 873

Advancing to step 6:
If we divide 8230 by 873, we get 9 and a remainder of 373.
Write down 9 as next digit of the result. 
Result so far: 269.0
The remainder is 373 after subtracting 7857 from 8230.
Fetch the next digit (0) from the dividend, attach it to 373 and continue: 3730 / 873

Advancing to step 7:
When dividing 3730 by 873, we get 4 with a remainder of 238.
The number 4 becomes the next digit in our result. 
Result so far: 2694.0
If we take 3492 away from 3730, we end up with 238.
Grab the next digit (1) from the dividend, add it to 238, then carry on: 2381 / 873

Advancing to step 8:
If we divide 2381 by 873, we get 2 and a remainder of 635.
The next digit of our result is 2. 
Result so far: 26942.0
If we take 1746 away from 2381, we end up with 635.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6350, and continue the process.

Moving on to step 9:
When dividing 6350 by 873, we get 7 with a remainder of 239.
The number 7 becomes the next digit in our result. 
Result so far: 26942.7
Subtracting 6111 from 6350 leaves us with 239.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2390, and continue the process.

Step 10:
The number 873 fits into 2390 2 times, leaving a remainder of 644.
The number 2 becomes the next digit in our result. 
Result so far: 26942.72
Subtracting 1746 from 2390 leaves us with 644.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6440, and continue the process.

Advancing to step 11:
6440 divided by 873 is 7 with a remainder of 329.
The next digit of our result is 7. 
Result so far: 26942.727
If we take 6111 away from 6440, we end up with 329.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3290, and continue the process.

On to step 12:
3290 divided by 873 is 3 with a remainder of 671.
Write down 3 as next digit of the result. 
Result so far: 26942.7273
Deduct 2619 from 3290 and we're left with 671.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6710, and continue the process.

Moving on to step 13:
873 goes into 6710 7 times with a remainder of 599.
Use 7 as the next digit of our solution. 
Result so far: 26942.72737
Subtracting 6111 from 6710 leaves us with 599.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5990, and continue the process.

Let's proceed to step 14:
When dividing 5990 by 873, we get 6 with a remainder of 752.
Put 6 as the next digit of the answer. 
Result so far: 26942.727376
The remainder is 752 after subtracting 5238 from 5990.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7520, and continue the process.

Going ahead to step 15:
873 goes into 7520 8 times with a remainder of 536.
Write down 8 as next digit of the result. 
Result so far: 26942.7273768
Subtract 6984 from 7520 to get 536.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5360, and continue the process.

Advancing to step 16:
873 goes into 5360 6 times with a remainder of 122.
The next digit of our result is 6. 
Result so far: 26942.72737686
Subtract 5238 from 5360 to get 122.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1220, and continue the process.

The quotient of the division is 26942.72737686, and the remainder is 1.22e-07.