331211112111221 has 4 divisors (see below), whose sum is σ = 334932585281100. Its totient is φ = 327489638941344.

The previous prime is 331211112111181. The next prime is 331211112111223. The reversal of 331211112111221 is 122111211112133.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 151890490276996 + 179320621834225 = 12324386^2 + 13391065^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331211112111221 is a prime.

It is a super-2 number, since 2×331211112111221² (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 (331211112111223) 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, 1860736584806 + ... + 1860736584983.

It is an arithmetic number, because the mean of its divisors is an integer number (83733146320275).

Almost surely, 2^{331211112111221} is an apocalyptic number.

It is an amenable number.

331211112111221 is a deficient number, since it is larger than the sum of its proper divisors (3721473169879).

331211112111221 is an equidigital number, since it uses as much as digits as its factorization.

331211112111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3721473169878.

The product of its digits is 144, while the sum is 23.

Adding to 331211112111221 its reverse (122111211112133), we get a palindrome (453322323223354).

The spelling of 331211112111221 in words is "three hundred thirty-one trillion, two hundred eleven billion, one hundred twelve million, one hundred eleven thousand, two hundred twenty-one".