320330321 has 4 divisors (see below), whose sum is σ = 320379444. Its totient is φ = 320281200.

The previous prime is 320330273. The next prime is 320330323. The reversal of 320330321 is 123033023.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 123321025 + 197009296 = 11105^2 + 14036^2 .

It is a cyclic number.

It is not a de Polignac number, because 320330321 - 2²⁶ = 253221457 is a prime.

It is a super-2 number, since 2×320330321² = 205223029103926082, which contains 22 as substring.

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 320330321.

It is not an unprimeable number, because it can be changed into a prime (320330323) 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, 12950 + ... + 28431.

It is an arithmetic number, because the mean of its divisors is an integer number (80094861).

Almost surely, 2^320330321 is an apocalyptic number.

It is an amenable number.

320330321 is a deficient number, since it is larger than the sum of its proper divisors (49123).

320330321 is an equidigital number, since it uses as much as digits as its factorization.

320330321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49122.

The product of its (nonzero) digits is 324, while the sum is 17.

The square root of 320330321 is about 17897.7741912228. The cubic root of 320330321 is about 684.2256481386.

Adding to 320330321 its reverse (123033023), we get a palindrome (443363344).

The spelling of 320330321 in words is "three hundred twenty million, three hundred thirty thousand, three hundred twenty-one".