13121517516 has 12 divisors (see below), whose sum is σ = 30616874232. Its totient is φ = 4373839168.

The previous prime is 13121517499. The next prime is 13121517523. The reversal of 13121517516 is 61571512131.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 546729885 + ... + 546729908.

It is an arithmetic number, because the mean of its divisors is an integer number (2551406186).

Almost surely, 2^13121517516 is an apocalyptic number.

It is an amenable number.

13121517516 is an abundant number, since it is smaller than the sum of its proper divisors (17495356716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13121517516 is a wasteful number, since it uses less digits than its factorization.

13121517516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093459800 (or 1093459798 counting only the distinct ones).

The product of its digits is 6300, while the sum is 33.

The spelling of 13121517516 in words is "thirteen billion, one hundred twenty-one million, five hundred seventeen thousand, five hundred sixteen".