121242312431 has 4 divisors (see below), whose sum is σ = 121245084312. Its totient is φ = 121239540552.

The previous prime is 121242312407. The next prime is 121242312439. The reversal of 121242312431 is 134213242121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121242312431 - 2¹⁴ = 121242296047 is a prime.

It is a super-2 number, since 2×121242312431² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121242312431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121242312439) 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, 1319261 + ... + 1408166.

It is an arithmetic number, because the mean of its divisors is an integer number (30311271078).

Almost surely, 2^121242312431 is an apocalyptic number.

121242312431 is a deficient number, since it is larger than the sum of its proper divisors (2771881).

121242312431 is an equidigital number, since it uses as much as digits as its factorization.

121242312431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2771880.

The product of its digits is 2304, while the sum is 26.

Adding to 121242312431 its reverse (134213242121), we get a palindrome (255455554552).

The spelling of 121242312431 in words is "one hundred twenty-one billion, two hundred forty-two million, three hundred twelve thousand, four hundred thirty-one".