12404431121 has 4 divisors (see below), whose sum is σ = 12589571952. Its totient is φ = 12219290292.

The previous prime is 12404431097. The next prime is 12404431129. The reversal of 12404431121 is 12113440421.

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: 12113440421 = 419 ⋅28910359.

It is a cyclic number.

It is not a de Polignac number, because 12404431121 - 2³⁰ = 11330689297 is a prime.

It is a super-2 number, since 2×12404431121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12404431129) 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, 92570315 + ... + 92570448.

It is an arithmetic number, because the mean of its divisors is an integer number (3147392988).

Almost surely, 2^12404431121 is an apocalyptic number.

It is an amenable number.

12404431121 is a deficient number, since it is larger than the sum of its proper divisors (185140831).

12404431121 is an equidigital number, since it uses as much as digits as its factorization.

12404431121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185140830.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 12404431121 its reverse (12113440421), we get a palindrome (24517871542).

The spelling of 12404431121 in words is "twelve billion, four hundred four million, four hundred thirty-one thousand, one hundred twenty-one".