16317321 has 8 divisors (see below), whose sum is σ = 21871104. Its totient is φ = 10820880.

The previous prime is 16317311. The next prime is 16317337. The reversal of 16317321 is 12371361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16317321 - 2⁷ = 16317193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16317291 and 16317300.

It is not an unprimeable number, because it can be changed into a prime (16317311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13666 + ... + 14811.

It is an arithmetic number, because the mean of its divisors is an integer number (2733888).

Almost surely, 2^16317321 is an apocalyptic number.

It is an amenable number.

16317321 is a deficient number, since it is larger than the sum of its proper divisors (5553783).

16317321 is a wasteful number, since it uses less digits than its factorization.

16317321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28671.

The product of its digits is 756, while the sum is 24.

The square root of 16317321 is about 4039.4703860779. The cubic root of 16317321 is about 253.6391480347.

Adding to 16317321 its reverse (12371361), we get a palindrome (28688682).

The spelling of 16317321 in words is "sixteen million, three hundred seventeen thousand, three hundred twenty-one".