121323513161 has 4 divisors (see below), whose sum is σ = 121330486032. Its totient is φ = 121316540292.

The previous prime is 121323513133. The next prime is 121323513173. The reversal of 121323513161 is 161315323121.

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 121323513161 - 2¹⁰ = 121323512137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121323513061) 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, 3460271 + ... + 3495156.

It is an arithmetic number, because the mean of its divisors is an integer number (30332621508).

Almost surely, 2^121323513161 is an apocalyptic number.

It is an amenable number.

121323513161 is a deficient number, since it is larger than the sum of its proper divisors (6972871).

121323513161 is an equidigital number, since it uses as much as digits as its factorization.

121323513161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6972870.

The product of its digits is 3240, while the sum is 29.

Adding to 121323513161 its reverse (161315323121), we get a palindrome (282638836282).

The spelling of 121323513161 in words is "one hundred twenty-one billion, three hundred twenty-three million, five hundred thirteen thousand, one hundred sixty-one".