321431321 has 8 divisors (see below), whose sum is σ = 337797504. Its totient is φ = 305469360.

The previous prime is 321431269. The next prime is 321431323. The reversal of 321431321 is 123134123.

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-321431321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321431293 and 321431302.

It is not an unprimeable number, because it can be changed into a prime (321431323) 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 7 ways as a sum of consecutive naturals, for example, 99425 + ... + 102606.

It is an arithmetic number, because the mean of its divisors is an integer number (42224688).

Almost surely, 2^321431321 is an apocalyptic number.

It is an amenable number.

321431321 is a deficient number, since it is larger than the sum of its proper divisors (16366183).

321431321 is a wasteful number, since it uses less digits than its factorization.

321431321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202111.

The product of its digits is 432, while the sum is 20.

The square root of 321431321 is about 17928.5058217354. The cubic root of 321431321 is about 685.0086638221.

Adding to 321431321 its reverse (123134123), we get a palindrome (444565444).

The spelling of 321431321 in words is "three hundred twenty-one million, four hundred thirty-one thousand, three hundred twenty-one".