16339321 has 4 divisors (see below), whose sum is σ = 16349044. Its totient is φ = 16329600.

The previous prime is 16339319. The next prime is 16339327. The reversal of 16339321 is 12393361.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12393361 = 53 ⋅233837.

It can be written as a sum of positive squares in 2 ways, for example, as 6969600 + 9369721 = 2640^2 + 3061^2 .

It is a cyclic number.

It is not a de Polignac number, because 16339321 - 2¹ = 16339319 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16339321.

It is not an unprimeable number, because it can be changed into a prime (16339327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1620 + ... + 5941.

It is an arithmetic number, because the mean of its divisors is an integer number (4087261).

Almost surely, 2^16339321 is an apocalyptic number.

16339321 is the 2161-st nonagonal number.

It is an amenable number.

16339321 is a deficient number, since it is larger than the sum of its proper divisors (9723).

16339321 is an equidigital number, since it uses as much as digits as its factorization.

16339321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9722.

The product of its digits is 2916, while the sum is 28.

The square root of 16339321 is about 4042.1925980834. The cubic root of 16339321 is about 253.7530873948.

The spelling of 16339321 in words is "sixteen million, three hundred thirty-nine thousand, three hundred twenty-one".