239328021 has 4 divisors (see below), whose sum is σ = 319104032. Its totient is φ = 159552012.

The previous prime is 239327993. The next prime is 239328043. The reversal of 239328021 is 120823932.

It is a happy number.

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.

It is not a de Polignac number, because 239328021 - 2¹⁴ = 239311637 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 239328021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (239328421) 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, 39888001 + ... + 39888006.

It is an arithmetic number, because the mean of its divisors is an integer number (79776008).

Almost surely, 2^239328021 is an apocalyptic number.

It is an amenable number.

239328021 is a deficient number, since it is larger than the sum of its proper divisors (79776011).

239328021 is an equidigital number, since it uses as much as digits as its factorization.

239328021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79776010.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 239328021 is about 15470.2301534269. The cubic root of 239328021 is about 620.8659604231.

The spelling of 239328021 in words is "two hundred thirty-nine million, three hundred twenty-eight thousand, twenty-one".