A:
Positive:
1 x 212511537 x 303587911 x 193192349 x 43369777 x 27598989 x 238777443 x 47971539 x 39427623 x 34111979 x 217073101 x 68534361 x 4873
Negative:
-1 x -21251153-7 x -3035879-11 x -1931923-49 x -433697-77 x -275989-89 x -238777-443 x -47971-539 x -39427-623 x -34111-979 x -21707-3101 x -6853-4361 x -4873
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 21,251,153, 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 | 21,251,153 | |
| -1 | -21,251,153 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,251,153.
Example:
1 x 21,251,153 = 21,251,153
and
-1 x -21,251,153 = 21,251,153
Notice both answers equal 21,251,153
With that explanation out of the way, let's continue. Next, we take the number 21,251,153 and divide it by 2:
21,251,153 ÷ 2 = 10,625,576.5
If the quotient is a whole number, then 2 and 10,625,576.5 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 | 21,251,153 | |
| -1 | -21,251,153 |
Now, we try dividing 21,251,153 by 3:
21,251,153 ÷ 3 = 7,083,717.6667
If the quotient is a whole number, then 3 and 7,083,717.6667 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 | 21,251,153 | |
| -1 | -21,251,153 |
Let's try dividing by 4:
21,251,153 ÷ 4 = 5,312,788.25
If the quotient is a whole number, then 4 and 5,312,788.25 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 | 21,251,153 | |
| -1 | 21,251,153 |
If you did it right, you will end up with this table:
| 1 | 7 | 11 | 49 | 77 | 89 | 443 | 539 | 623 | 979 | 3,101 | 4,361 | 4,873 | 6,853 | 21,707 | 34,111 | 39,427 | 47,971 | 238,777 | 275,989 | 433,697 | 1,931,923 | 3,035,879 | 21,251,153 |
| -1 | -7 | -11 | -49 | -77 | -89 | -443 | -539 | -623 | -979 | -3,101 | -4,361 | -4,873 | -6,853 | -21,707 | -34,111 | -39,427 | -47,971 | -238,777 | -275,989 | -433,697 | -1,931,923 | -3,035,879 | -21,251,153 |
Here are some more numbers to try:
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