331131031221 has 32 divisors (see below), whose sum is σ = 453743002240. Its totient is φ = 214724908800.

The previous prime is 331131031163. The next prime is 331131031237. The reversal of 331131031221 is 122130131133.

It is a happy number.

331131031221 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 331131031221 - 2¹⁸ = 331130769077 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 (331131031261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10416411 + ... + 10448151.

It is an arithmetic number, because the mean of its divisors is an integer number (14179468820).

Almost surely, 2^331131031221 is an apocalyptic number.

It is an amenable number.

331131031221 is a deficient number, since it is larger than the sum of its proper divisors (122611971019).

331131031221 is a wasteful number, since it uses less digits than its factorization.

331131031221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32437.

The product of its (nonzero) digits is 324, while the sum is 21.

Adding to 331131031221 its reverse (122130131133), we get a palindrome (453261162354).

The spelling of 331131031221 in words is "three hundred thirty-one billion, one hundred thirty-one million, thirty-one thousand, two hundred twenty-one".