321042431 has 4 divisors (see below), whose sum is σ = 321078552. Its totient is φ = 321006312.

The previous prime is 321042427. The next prime is 321042439. The reversal of 321042431 is 134240123.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 134240123 = 5903 ⋅22741.

It is a cyclic number.

It is not a de Polignac number, because 321042431 - 2² = 321042427 is a prime.

It is a super-2 number, since 2×321042431² = 206136485004779522, 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 (321042439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5636 + ... + 25958.

It is an arithmetic number, because the mean of its divisors is an integer number (80269638).

Almost surely, 2^321042431 is an apocalyptic number.

321042431 is a deficient number, since it is larger than the sum of its proper divisors (36121).

321042431 is a wasteful number, since it uses less digits than its factorization.

321042431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36120.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 321042431 is about 17917.6569617793. The cubic root of 321042431 is about 684.7322952712.

Adding to 321042431 its reverse (134240123), we get a palindrome (455282554).

The spelling of 321042431 in words is "three hundred twenty-one million, forty-two thousand, four hundred thirty-one".