Q: Is 21,121,230 a Composite Number?

Why is 21,121,230 a composite number?

A composite number is a number that can be divided evenly by more numbers than 1 and itself. It is the opposite of a prime number.

The number 21,121,230 can be evenly divided by 1 2 3 5 6 10 13 15 26 30 31 39 62 65 78 93 130 155 186 195 310 390 403 465 806 930 1,209 1,747 2,015 2,418 3,494 4,030 5,241 6,045 8,735 10,482 12,090 17,470 22,711 26,205 45,422 52,410 54,157 68,133 108,314 113,555 136,266 162,471 227,110 270,785 324,942 340,665 541,570 681,330 704,041 812,355 1,408,082 1,624,710 2,112,123 3,520,205 4,224,246 7,040,410 10,560,615 and 21,121,230, with no remainder.

Since 21,121,230 cannot be divided by just 1 and 21,121,230, it is a composite number.

More Examples

• All positive natural numbers are either a prime number or a composite number (except the number 1, which is neither).