121312331321 has 4 divisors (see below), whose sum is σ = 121313064192. Its totient is φ = 121311598452.

The previous prime is 121312331269. The next prime is 121312331333. The reversal of 121312331321 is 123133213121.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 121312331321 - 2¹⁰ = 121312330297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121312339321) 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, 12440 + ... + 492726.

It is an arithmetic number, because the mean of its divisors is an integer number (30328266048).

Almost surely, 2^121312331321 is an apocalyptic number.

It is an amenable number.

121312331321 is a deficient number, since it is larger than the sum of its proper divisors (732871).

121312331321 is an equidigital number, since it uses as much as digits as its factorization.

121312331321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732870.

The product of its digits is 648, while the sum is 23.

Adding to 121312331321 its reverse (123133213121), we get a palindrome (244445544442).

The spelling of 121312331321 in words is "one hundred twenty-one billion, three hundred twelve million, three hundred thirty-one thousand, three hundred twenty-one".