123512143413121 has 4 divisors (see below), whose sum is σ = 123680645655892. Its totient is φ = 123343641170352.

The previous prime is 123512143413017. The next prime is 123512143413137. The reversal of 123512143413121 is 121314341215321.

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

It can be written as a sum of positive squares in 2 ways, for example, as 115799659050625 + 7712484362496 = 10761025^2 + 2777136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123512143413121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123512143413161) 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, 84251120286 + ... + 84251121751.

It is an arithmetic number, because the mean of its divisors is an integer number (30920161413973).

Almost surely, 2^{123512143413121} is an apocalyptic number.

It is an amenable number.

123512143413121 is a deficient number, since it is larger than the sum of its proper divisors (168502242771).

123512143413121 is an equidigital number, since it uses as much as digits as its factorization.

123512143413121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168502242770.

The product of its digits is 17280, while the sum is 34.

Adding to 123512143413121 its reverse (121314341215321), we get a palindrome (244826484628442).

The spelling of 123512143413121 in words is "one hundred twenty-three trillion, five hundred twelve billion, one hundred forty-three million, four hundred thirteen thousand, one hundred twenty-one".