13215898817 has 4 divisors (see below), whose sum is σ = 14417344176. Its totient is φ = 12014453460.

The previous prime is 13215898789. The next prime is 13215898849. The reversal of 13215898817 is 71889851231.

13215898817 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 13215898817 - 2¹² = 13215894721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13215898117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 600722663 + ... + 600722684.

It is an arithmetic number, because the mean of its divisors is an integer number (3604336044).

Almost surely, 2^13215898817 is an apocalyptic number.

It is an amenable number.

13215898817 is a deficient number, since it is larger than the sum of its proper divisors (1201445359).

13215898817 is a wasteful number, since it uses less digits than its factorization.

13215898817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1201445358.

The product of its digits is 967680, while the sum is 53.

The spelling of 13215898817 in words is "thirteen billion, two hundred fifteen million, eight hundred ninety-eight thousand, eight hundred seventeen".