123715517321 has 4 divisors (see below), whose sum is σ = 134962382544. Its totient is φ = 112468652100.

The previous prime is 123715517311. The next prime is 123715517357.

123715517321 is nontrivially palindromic in base 10.

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 123715517321 - 2³⁴ = 106535648137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123715517311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5623432595 + ... + 5623432616.

It is an arithmetic number, because the mean of its divisors is an integer number (33740595636).

Almost surely, 2^123715517321 is an apocalyptic number.

123715517321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

123715517321 is a deficient number, since it is larger than the sum of its proper divisors (11246865223).

123715517321 is a wasteful number, since it uses less digits than its factorization.

123715517321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11246865222.

The product of its digits is 44100, while the sum is 38.

The spelling of 123715517321 in words is "one hundred twenty-three billion, seven hundred fifteen million, five hundred seventeen thousand, three hundred twenty-one".