320023321 has 4 divisors (see below), whose sum is σ = 320059600. Its totient is φ = 319987044.

The previous prime is 320023309. The next prime is 320023373. The reversal of 320023321 is 123320023.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 123320023 = 17 ⋅7254119.

It is a cyclic number.

It is not a de Polignac number, because 320023321 - 2²⁷ = 185805593 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320023295 and 320023304.

It is not an unprimeable number, because it can be changed into a prime (320023721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4570 + ... + 25708.

It is an arithmetic number, because the mean of its divisors is an integer number (80014900).

Almost surely, 2^320023321 is an apocalyptic number.

It is an amenable number.

320023321 is a deficient number, since it is larger than the sum of its proper divisors (36279).

320023321 is a wasteful number, since it uses less digits than its factorization.

320023321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36278.

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 320023321 is about 17889.1956498888. The cubic root of 320023321 is about 684.0069942458.

Adding to 320023321 its reverse (123320023), we get a palindrome (443343344).

The spelling of 320023321 in words is "three hundred twenty million, twenty-three thousand, three hundred twenty-one".