323131021 has 4 divisors (see below), whose sum is σ = 334273500. Its totient is φ = 311988544.

The previous prime is 323131007. The next prime is 323131031. The reversal of 323131021 is 120131323.

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

It can be written as a sum of positive squares in 2 ways, for example, as 137217796 + 185913225 = 11714^2 + 13635^2 .

It is a cyclic number.

It is not a de Polignac number, because 323131021 - 2⁵ = 323130989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 323130986 and 323131004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (323131031) 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 3 ways as a sum of consecutive naturals, for example, 5571196 + ... + 5571253.

It is an arithmetic number, because the mean of its divisors is an integer number (83568375).

Almost surely, 2^323131021 is an apocalyptic number.

It is an amenable number.

323131021 is a deficient number, since it is larger than the sum of its proper divisors (11142479).

323131021 is a wasteful number, since it uses less digits than its factorization.

323131021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11142478.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 323131021 is about 17975.8454877650. The cubic root of 323131021 is about 686.2139632681.

Adding to 323131021 its reverse (120131323), we get a palindrome (443262344).

The spelling of 323131021 in words is "three hundred twenty-three million, one hundred thirty-one thousand, twenty-one".