216078121913 has 4 divisors (see below), whose sum is σ = 216080071680. Its totient is φ = 216076172148.

The previous prime is 216078121877. The next prime is 216078121939. The reversal of 216078121913 is 319121870612.

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 216078121913 - 2⁶ = 216078121849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216078121993) 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, 797945 + ... + 1033862.

It is an arithmetic number, because the mean of its divisors is an integer number (54020017920).

Almost surely, 2^216078121913 is an apocalyptic number.

It is an amenable number.

216078121913 is a deficient number, since it is larger than the sum of its proper divisors (1949767).

216078121913 is a wasteful number, since it uses less digits than its factorization.

216078121913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1949766.

The product of its (nonzero) digits is 36288, while the sum is 41.

The spelling of 216078121913 in words is "two hundred sixteen billion, seventy-eight million, one hundred twenty-one thousand, nine hundred thirteen".