331023121321 has 4 divisors (see below), whose sum is σ = 350495069652. Its totient is φ = 311551172992.

The previous prime is 331023121307. The next prime is 331023121333. The reversal of 331023121321 is 123121320133.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123121320133 = 7 ⋅17588760019.

It can be written as a sum of positive squares in 2 ways, for example, as 105456067600 + 225567053721 = 324740^2 + 474939^2 .

It is a cyclic number.

It is not a de Polignac number, because 331023121321 - 2⁷ = 331023121193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 331023121292 and 331023121301.

It is not an unprimeable number, because it can be changed into a prime (331023121381) 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, 9735974140 + ... + 9735974173.

It is an arithmetic number, because the mean of its divisors is an integer number (87623767413).

Almost surely, 2^331023121321 is an apocalyptic number.

It is an amenable number.

331023121321 is a deficient number, since it is larger than the sum of its proper divisors (19471948331).

331023121321 is a wasteful number, since it uses less digits than its factorization.

331023121321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19471948330.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 331023121321 its reverse (123121320133), we get a palindrome (454144441454).

The spelling of 331023121321 in words is "three hundred thirty-one billion, twenty-three million, one hundred twenty-one thousand, three hundred twenty-one".