331211310123121 has 4 divisors (see below), whose sum is σ = 331301484727972. Its totient is φ = 331121135518272.

The previous prime is 331211310123107. The next prime is 331211310123157. The reversal of 331211310123121 is 121321013112133.

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 16956803922496 + 314254506200625 = 4117864^2 + 17727225^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331211310123121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (331211310123181) 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, 45087296916 + ... + 45087304261.

It is an arithmetic number, because the mean of its divisors is an integer number (82825371181993).

Almost surely, 2^{331211310123121} is an apocalyptic number.

It is an amenable number.

331211310123121 is a deficient number, since it is larger than the sum of its proper divisors (90174604851).

331211310123121 is an equidigital number, since it uses as much as digits as its factorization.

331211310123121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90174604850.

The product of its (nonzero) digits is 648, while the sum is 25.

Adding to 331211310123121 its reverse (121321013112133), we get a palindrome (452532323235254).

The spelling of 331211310123121 in words is "three hundred thirty-one trillion, two hundred eleven billion, three hundred ten million, one hundred twenty-three thousand, one hundred twenty-one".