16321707

16321707 is the decimal notation for the positive integer 16,321,707. It is an eight-digit, odd, composite number. The integer factors as 9 × 1,813,523, so it is divisible by 3 and by 9. The sum of its decimal digits is 1+6+3+2+1+7+0+7 = 27, confirming divisibility by 9 and giving a digital root of 9.

In modular arithmetic, 16,321,707 is congruent to 3 modulo 4 and modulo 8; it is congruent to 0 modulo 3. It is not divisible by 2 or 5, and a brief check shows it is not divisible by 11. The remaining factorization beyond 3^2 depends on the primality of 1,813,523; basic checks indicate 1,813,523 has no small prime divisor below 100, so the cofactor is either prime or has larger factors.

There is no widely known mathematical object or historical event specifically associated with the number 16,321,707. It is primarily of interest in contexts that involve ordinary arithmetic properties of eight-digit integers, such as factorization demonstrations or modular arithmetic examples.

See also: divisibility tests, prime factorization, digital sum, and modular arithmetic.