331322231221 has 4 divisors (see below), whose sum is σ = 350811774252. Its totient is φ = 311832688192.

The previous prime is 331322231171. The next prime is 331322231321. The reversal of 331322231221 is 122132223133.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122132223133 = 47 ⋅2598557939.

It can be written as a sum of positive squares in 2 ways, for example, as 129950156196 + 201372075025 = 360486^2 + 448745^2 .

It is a cyclic number.

It is not a de Polignac number, because 331322231221 - 2²⁹ = 330785360309 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 (331322231321) 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, 9744771490 + ... + 9744771523.

It is an arithmetic number, because the mean of its divisors is an integer number (87702943563).

Almost surely, 2^331322231221 is an apocalyptic number.

It is an amenable number.

331322231221 is a deficient number, since it is larger than the sum of its proper divisors (19489543031).

331322231221 is a wasteful number, since it uses less digits than its factorization.

331322231221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19489543030.

The product of its digits is 2592, while the sum is 25.

Adding to 331322231221 its reverse (122132223133), we get a palindrome (453454454354).

The spelling of 331322231221 in words is "three hundred thirty-one billion, three hundred twenty-two million, two hundred thirty-one thousand, two hundred twenty-one".