16382921 has 4 divisors (see below), whose sum is σ = 17245200. Its totient is φ = 15520644.

The previous prime is 16382909. The next prime is 16382963. The reversal of 16382921 is 12928361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12928361 = 1583 ⋅8167.

It is not a de Polignac number, because 16382921 - 2⁶ = 16382857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16382981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 431111 + ... + 431148.

It is an arithmetic number, because the mean of its divisors is an integer number (4311300).

Almost surely, 2^16382921 is an apocalyptic number.

It is an amenable number.

16382921 is a deficient number, since it is larger than the sum of its proper divisors (862279).

16382921 is an equidigital number, since it uses as much as digits as its factorization.

16382921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862278.

The product of its digits is 5184, while the sum is 32.

The square root of 16382921 is about 4047.5821177587. The cubic root of 16382921 is about 253.9785926530.

The spelling of 16382921 in words is "sixteen million, three hundred eighty-two thousand, nine hundred twenty-one".