A:
Positive:
1 x 2100315113 x 161562719 x 110542931 x 677521169 x 124279211 x 99541247 x 85033403 x 52117589 x 356592743 x 76573211 x 65414009 x 5239
Negative:
-1 x -21003151-13 x -1615627-19 x -1105429-31 x -677521-169 x -124279-211 x -99541-247 x -85033-403 x -52117-589 x -35659-2743 x -7657-3211 x -6541-4009 x -5239
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 21,003,151, 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 | 21,003,151 | |
| -1 | -21,003,151 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,003,151.
Example:
1 x 21,003,151 = 21,003,151
and
-1 x -21,003,151 = 21,003,151
Notice both answers equal 21,003,151
With that explanation out of the way, let's continue. Next, we take the number 21,003,151 and divide it by 2:
21,003,151 ÷ 2 = 10,501,575.5
If the quotient is a whole number, then 2 and 10,501,575.5 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 | 21,003,151 | |
| -1 | -21,003,151 |
Now, we try dividing 21,003,151 by 3:
21,003,151 ÷ 3 = 7,001,050.3333
If the quotient is a whole number, then 3 and 7,001,050.3333 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 | 21,003,151 | |
| -1 | -21,003,151 |
Let's try dividing by 4:
21,003,151 ÷ 4 = 5,250,787.75
If the quotient is a whole number, then 4 and 5,250,787.75 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 | 21,003,151 | |
| -1 | 21,003,151 |
If you did it right, you will end up with this table:
| 1 | 13 | 19 | 31 | 169 | 211 | 247 | 403 | 589 | 2,743 | 3,211 | 4,009 | 5,239 | 6,541 | 7,657 | 35,659 | 52,117 | 85,033 | 99,541 | 124,279 | 677,521 | 1,105,429 | 1,615,627 | 21,003,151 |
| -1 | -13 | -19 | -31 | -169 | -211 | -247 | -403 | -589 | -2,743 | -3,211 | -4,009 | -5,239 | -6,541 | -7,657 | -35,659 | -52,117 | -85,033 | -99,541 | -124,279 | -677,521 | -1,105,429 | -1,615,627 | -21,003,151 |
Here are some more numbers to try:
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