331313312021 has 4 divisors (see below), whose sum is σ = 331370947500. Its totient is φ = 331255676544.

The previous prime is 331313312009. The next prime is 331313312023. The reversal of 331313312021 is 120213313133.

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 9496502500 + 321816809521 = 97450^2 + 567289^2 .

It is a cyclic number.

It is not a de Polignac number, because 331313312021 - 2⁶ = 331313311957 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 (331313312023) 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, 28809116 + ... + 28820613.

It is an arithmetic number, because the mean of its divisors is an integer number (82842736875).

Almost surely, 2^331313312021 is an apocalyptic number.

It is an amenable number.

331313312021 is a deficient number, since it is larger than the sum of its proper divisors (57635479).

331313312021 is an equidigital number, since it uses as much as digits as its factorization.

331313312021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57635478.

The product of its (nonzero) digits is 972, while the sum is 23.

Adding to 331313312021 its reverse (120213313133), we get a palindrome (451526625154).

The spelling of 331313312021 in words is "three hundred thirty-one billion, three hundred thirteen million, three hundred twelve thousand, twenty-one".