A:
Positive:
1 x 2101024913 x 161617317 x 123589771 x 295919103 x 203983169 x 124321221 x 95069923 x 227631207 x 174071339 x 156911751 x 119992873 x 7313
Negative:
-1 x -21010249-13 x -1616173-17 x -1235897-71 x -295919-103 x -203983-169 x -124321-221 x -95069-923 x -22763-1207 x -17407-1339 x -15691-1751 x -11999-2873 x -7313
Unfortunately, there's not simple formula to identifying all of the factors of a number and it can be a tedious process when trying to identify the divisors of larger numbers. To find the factor combinations of the number 21,010,249, it is easier to work with a table - it's called factoring from the outside in.
We start by creating a table and writing 1 on the left side and then the number we're trying to find the factors for on the right side in a table. Then, below that, write the numbers as a negative as well.
| 1 | 21,010,249 | |
| -1 | -21,010,249 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,010,249.
Example:
1 x 21,010,249 = 21,010,249
and
-1 x -21,010,249 = 21,010,249
Notice both answers equal 21,010,249
With that explanation out of the way, let's continue. Next, we take the number 21,010,249 and divide it by 2:
21,010,249 ÷ 2 = 10,505,124.5
If the quotient is a whole number, then 2 and 10,505,124.5 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 21,010,249 | |
| -1 | -21,010,249 |
Now, we try dividing 21,010,249 by 3:
21,010,249 ÷ 3 = 7,003,416.3333
If the quotient is a whole number, then 3 and 7,003,416.3333 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 21,010,249 | |
| -1 | -21,010,249 |
Let's try dividing by 4:
21,010,249 ÷ 4 = 5,252,562.25
If the quotient is a whole number, then 4 and 5,252,562.25 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 21,010,249 | |
| -1 | 21,010,249 |
If you did it right, you will end up with this table:
| 1 | 13 | 17 | 71 | 103 | 169 | 221 | 923 | 1,207 | 1,339 | 1,751 | 2,873 | 7,313 | 11,999 | 15,691 | 17,407 | 22,763 | 95,069 | 124,321 | 203,983 | 295,919 | 1,235,897 | 1,616,173 | 21,010,249 |
| -1 | -13 | -17 | -71 | -103 | -169 | -221 | -923 | -1,207 | -1,339 | -1,751 | -2,873 | -7,313 | -11,999 | -15,691 | -17,407 | -22,763 | -95,069 | -124,321 | -203,983 | -295,919 | -1,235,897 | -1,616,173 | -21,010,249 |
Here are some more numbers to try:
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