331311212313221 has 4 divisors (see below), whose sum is σ = 378641385500832. Its totient is φ = 283981039125612.

The previous prime is 331311212313197. The next prime is 331311212313251. The reversal of 331311212313221 is 122313212113133.

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 331311212313221 - 2⁶ = 331311212313157 is a prime.

It is a super-2 number, since 2×331311212313221² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331311212313251) 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, 23665086593795 + ... + 23665086593808.

It is an arithmetic number, because the mean of its divisors is an integer number (94660346375208).

Almost surely, 2^{331311212313221} is an apocalyptic number.

It is an amenable number.

331311212313221 is a deficient number, since it is larger than the sum of its proper divisors (47330173187611).

331311212313221 is an equidigital number, since it uses as much as digits as its factorization.

331311212313221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47330173187610.

The product of its digits is 3888, while the sum is 29.

Adding to 331311212313221 its reverse (122313212113133), we get a palindrome (453624424426354).

The spelling of 331311212313221 in words is "three hundred thirty-one trillion, three hundred eleven billion, two hundred twelve million, three hundred thirteen thousand, two hundred twenty-one".