320001321 has 4 divisors (see below), whose sum is σ = 426668432. Its totient is φ = 213334212.

The previous prime is 320001317. The next prime is 320001347. The reversal of 320001321 is 123100023.

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 320001321 - 2² = 320001317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320001297 and 320001306.

It is not an unprimeable number, because it can be changed into a prime (320001301) 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, 53333551 + ... + 53333556.

It is an arithmetic number, because the mean of its divisors is an integer number (106667108).

Almost surely, 2^320001321 is an apocalyptic number.

It is an amenable number.

320001321 is a deficient number, since it is larger than the sum of its proper divisors (106667111).

320001321 is a wasteful number, since it uses less digits than its factorization.

320001321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106667110.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 320001321 is about 17888.5807430327. The cubic root of 320001321 is about 683.9913198686.

Adding to 320001321 its reverse (123100023), we get a palindrome (443101344).

The spelling of 320001321 in words is "three hundred twenty million, one thousand, three hundred twenty-one".