123312320013 has 4 divisors (see below), whose sum is σ = 164416426688. Its totient is φ = 82208213340.

The previous prime is 123312319993. The next prime is 123312320041. The reversal of 123312320013 is 310023213321.

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 not a de Polignac number, because 123312320013 - 2²² = 123308125709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123312320093) 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, 20552053333 + ... + 20552053338.

It is an arithmetic number, because the mean of its divisors is an integer number (41104106672).

Almost surely, 2^123312320013 is an apocalyptic number.

It is an amenable number.

123312320013 is a deficient number, since it is larger than the sum of its proper divisors (41104106675).

123312320013 is an equidigital number, since it uses as much as digits as its factorization.

123312320013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41104106674.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 123312320013 its reverse (310023213321), we get a palindrome (433335533334).

The spelling of 123312320013 in words is "one hundred twenty-three billion, three hundred twelve million, three hundred twenty thousand, thirteen".