323131223320021 has 4 divisors (see below), whose sum is σ = 323131525180992. Its totient is φ = 323130921459052.

The previous prime is 323131223319997. The next prime is 323131223320091. The reversal of 323131223320021 is 120023322131323.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 323131223320021 - 2³⁷ = 322993784366549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (323131223320091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149319055 + ... + 151467628.

It is an arithmetic number, because the mean of its divisors is an integer number (80782881295248).

Almost surely, 2^{323131223320021} is an apocalyptic number.

It is an amenable number.

323131223320021 is a deficient number, since it is larger than the sum of its proper divisors (301860971).

323131223320021 is a wasteful number, since it uses less digits than its factorization.

323131223320021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301860970.

The product of its (nonzero) digits is 7776, while the sum is 28.

Adding to 323131223320021 its reverse (120023322131323), we get a palindrome (443154545451344).

The spelling of 323131223320021 in words is "three hundred twenty-three trillion, one hundred thirty-one billion, two hundred twenty-three million, three hundred twenty thousand, twenty-one".