321320231 has 8 divisors (see below), whose sum is σ = 326952720. Its totient is φ = 315721152.

The previous prime is 321320221. The next prime is 321320269. The reversal of 321320231 is 132023123.

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-321320231 is a prime.

It is a super-2 number, since 2×321320231² = 206493381699786722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321320221) 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, 11456 + ... + 27818.

It is an arithmetic number, because the mean of its divisors is an integer number (40869090).

Almost surely, 2^321320231 is an apocalyptic number.

321320231 is a deficient number, since it is larger than the sum of its proper divisors (5632489).

321320231 is a wasteful number, since it uses less digits than its factorization.

321320231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16705.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 321320231 is about 17925.4074151747. The cubic root of 321320231 is about 684.9297393615.

Adding to 321320231 its reverse (132023123), we get a palindrome (453343354).

The spelling of 321320231 in words is "three hundred twenty-one million, three hundred twenty thousand, two hundred thirty-one".