320321 has 8 divisors (see below), whose sum is σ = 352320. Its totient is φ = 289872.

The previous prime is 320317. The next prime is 320329. The reversal of 320321 is 123023.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 320321 - 2² = 320317 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 320321.

It is not an unprimeable number, because it can be changed into a prime (320329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71 + ... + 803.

It is an arithmetic number, because the mean of its divisors is an integer number (44040).

2³²⁰³²¹ is an apocalyptic number.

It is an amenable number.

320321 is a deficient number, since it is larger than the sum of its proper divisors (31999).

320321 is a wasteful number, since it uses less digits than its factorization.

320321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775.

The product of its (nonzero) digits is 36, while the sum is 11.

The square root of 320321 is about 565.9690804275. The cubic root of 320321 is about 68.4219011521.

Adding to 320321 its reverse (123023), we get a palindrome (443344).

The spelling of 320321 in words is "three hundred twenty thousand, three hundred twenty-one", and thus it is an iban number.