331111221321 has 4 divisors (see below), whose sum is σ = 441481628432. Its totient is φ = 220740814212.

The previous prime is 331111221211. The next prime is 331111221379. The reversal of 331111221321 is 123122111133.

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 not a de Polignac number, because 331111221321 - 2¹⁵ = 331111188553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (331111221821) 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, 55185203551 + ... + 55185203556.

It is an arithmetic number, because the mean of its divisors is an integer number (110370407108).

Almost surely, 2^331111221321 is an apocalyptic number.

It is an amenable number.

331111221321 is a deficient number, since it is larger than the sum of its proper divisors (110370407111).

331111221321 is a wasteful number, since it uses less digits than its factorization.

331111221321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110370407110.

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

Adding to 331111221321 its reverse (123122111133), we get a palindrome (454233332454).

The spelling of 331111221321 in words is "three hundred thirty-one billion, one hundred eleven million, two hundred twenty-one thousand, three hundred twenty-one".