331312121 has 4 divisors (see below), whose sum is σ = 378642432. Its totient is φ = 283981812.

The previous prime is 331312109. The next prime is 331312129. The reversal of 331312121 is 121213133.

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, and also an emirpimes, since its reverse is a distinct semiprime: 121213133 = 929 ⋅130477.

It is a cyclic number.

It is not a de Polignac number, because 331312121 - 2¹⁴ = 331295737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 331312121.

It is not an unprimeable number, because it can be changed into a prime (331312129) 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, 23665145 + ... + 23665158.

It is an arithmetic number, because the mean of its divisors is an integer number (94660608).

Almost surely, 2^331312121 is an apocalyptic number.

It is an amenable number.

331312121 is a deficient number, since it is larger than the sum of its proper divisors (47330311).

331312121 is an equidigital number, since it uses as much as digits as its factorization.

331312121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47330310.

The product of its digits is 108, while the sum is 17.

The square root of 331312121 is about 18201.9812383158. The cubic root of 331312121 is about 691.9570018223.

Adding to 331312121 its reverse (121213133), we get a palindrome (452525254).

The spelling of 331312121 in words is "three hundred thirty-one million, three hundred twelve thousand, one hundred twenty-one".