321320345 has 8 divisors (see below), whose sum is σ = 389328576. Its totient is φ = 254560176.

The previous prime is 321320317. The next prime is 321320347. The reversal of 321320345 is 543023123.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321320345 is a prime.

It is a super-2 number, since 2×321320345² = 206493528221838050, 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 321320345.

It is not an unprimeable number, because it can be changed into a prime (321320347) 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, 311447 + ... + 312476.

It is an arithmetic number, because the mean of its divisors is an integer number (48666072).

Almost surely, 2^321320345 is an apocalyptic number.

It is an amenable number.

321320345 is a deficient number, since it is larger than the sum of its proper divisors (68008231).

321320345 is a wasteful number, since it uses less digits than its factorization.

321320345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624031.

The product of its (nonzero) digits is 2160, while the sum is 23.

The square root of 321320345 is about 17925.4105950185. The cubic root of 321320345 is about 684.9298203627.

Adding to 321320345 its reverse (543023123), we get a palindrome (864343468).

The spelling of 321320345 in words is "three hundred twenty-one million, three hundred twenty thousand, three hundred forty-five".