331121212321213 has 4 divisors (see below), whose sum is σ = 332579896076160. Its totient is φ = 329662528566268.

The previous prime is 331121212321201. The next prime is 331121212321217. The reversal of 331121212321213 is 312123212121133.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 331121212321213 - 2²¹ = 331121210224061 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 (331121212321217) 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, 729341877133 + ... + 729341877586.

It is an arithmetic number, because the mean of its divisors is an integer number (83144974019040).

Almost surely, 2^{331121212321213} is an apocalyptic number.

It is an amenable number.

331121212321213 is a deficient number, since it is larger than the sum of its proper divisors (1458683754947).

331121212321213 is a wasteful number, since it uses less digits than its factorization.

331121212321213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1458683754946.

The product of its digits is 2592, while the sum is 28.

Adding to 331121212321213 its reverse (312123212121133), we get a palindrome (643244424442346).

The spelling of 331121212321213 in words is "three hundred thirty-one trillion, one hundred twenty-one billion, two hundred twelve million, three hundred twenty-one thousand, two hundred thirteen".