331131112221 has 32 divisors (see below), whose sum is σ = 543578999040. Its totient is φ = 174603308544.

The previous prime is 331131112159. The next prime is 331131112243. The reversal of 331131112221 is 122211131133.

It is not a de Polignac number, because 331131112221 - 2⁶ = 331131112157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331131112261) 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, 606271 + ... + 1014803.

It is an arithmetic number, because the mean of its divisors is an integer number (16986843720).

Almost surely, 2^331131112221 is an apocalyptic number.

It is an amenable number.

331131112221 is a deficient number, since it is larger than the sum of its proper divisors (212447886819).

331131112221 is a wasteful number, since it uses less digits than its factorization.

331131112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411525.

The product of its digits is 216, while the sum is 21.

Adding to 331131112221 its reverse (122211131133), we get a palindrome (453342243354).

The spelling of 331131112221 in words is "three hundred thirty-one billion, one hundred thirty-one million, one hundred twelve thousand, two hundred twenty-one".