321344431 has 4 divisors (see below), whose sum is σ = 335315952. Its totient is φ = 307372912.

The previous prime is 321344423. The next prime is 321344437. The reversal of 321344431 is 134443123.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 321344431 - 2³ = 321344423 is a prime.

It is a super-2 number, since 2×321344431² = 206524486669427522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321344396 and 321344405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321344437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6985726 + ... + 6985771.

It is an arithmetic number, because the mean of its divisors is an integer number (83828988).

Almost surely, 2^321344431 is an apocalyptic number.

321344431 is a deficient number, since it is larger than the sum of its proper divisors (13971521).

321344431 is a wasteful number, since it uses less digits than its factorization.

321344431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13971520.

The product of its digits is 3456, while the sum is 25.

The square root of 321344431 is about 17926.0824219906. The cubic root of 321344431 is about 684.9469339253.

Adding to 321344431 its reverse (134443123), we get a palindrome (455787554).

The spelling of 321344431 in words is "three hundred twenty-one million, three hundred forty-four thousand, four hundred thirty-one".