331311313221 has 16 divisors (see below), whose sum is σ = 504895372800. Its totient is φ = 189305736048.

The previous prime is 331311313181. The next prime is 331311313231. The reversal of 331311313221 is 122313113133.

It is not a de Polignac number, because 331311313221 - 2¹⁰ = 331311312197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 331311313191 and 331311313200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331311313231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 351711 + ... + 886748.

It is an arithmetic number, because the mean of its divisors is an integer number (31555960800).

Almost surely, 2^331311313221 is an apocalyptic number.

It is an amenable number.

331311313221 is a deficient number, since it is larger than the sum of its proper divisors (173584059579).

331311313221 is a wasteful number, since it uses less digits than its factorization.

331311313221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1251208.

The product of its digits is 972, while the sum is 24.

Adding to 331311313221 its reverse (122313113133), we get a palindrome (453624426354).

The spelling of 331311313221 in words is "three hundred thirty-one billion, three hundred eleven million, three hundred thirteen thousand, two hundred twenty-one".