13015520321 has 4 divisors (see below), whose sum is σ = 13031335872. Its totient is φ = 12999704772.

The previous prime is 13015520207. The next prime is 13015520333. The reversal of 13015520321 is 12302551031.

It is a happy number.

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: 12302551031 = 97 ⋅126830423.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13015520321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13015520341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7906541 + ... + 7908186.

It is an arithmetic number, because the mean of its divisors is an integer number (3257833968).

Almost surely, 2^13015520321 is an apocalyptic number.

It is an amenable number.

13015520321 is a deficient number, since it is larger than the sum of its proper divisors (15815551).

13015520321 is an equidigital number, since it uses as much as digits as its factorization.

13015520321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15815550.

The product of its (nonzero) digits is 900, while the sum is 23.

The spelling of 13015520321 in words is "thirteen billion, fifteen million, five hundred twenty thousand, three hundred twenty-one".