Q: Is 21,210,210 a Composite Number?

Why is 21,210,210 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 21,210,210 can be evenly divided by 1 2 3 5 6 7 9 10 14 15 18 21 30 35 42 45 63 70 90 105 126 131 210 257 262 315 393 514 630 655 771 786 917 1,179 1,285 1,310 1,542 1,799 1,834 1,965 2,313 2,358 2,570 2,751 3,598 3,855 3,930 4,585 4,626 5,397 5,502 5,895 7,710 8,253 8,995 9,170 10,794 11,565 11,790 13,755 16,191 16,506 17,990 23,130 26,985 27,510 32,382 33,667 41,265 53,970 67,334 80,955 82,530 101,001 161,910 168,335 202,002 235,669 303,003 336,670 471,338 505,005 606,006 707,007 1,010,010 1,178,345 1,414,014 1,515,015 2,121,021 2,356,690 3,030,030 3,535,035 4,242,042 7,070,070 10,605,105 and 21,210,210, with no remainder.

Since 21,210,210 cannot be divided by just 1 and 21,210,210, 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).