13218071999 has 16 divisors (see below), whose sum is σ = 15281843616. Its totient is φ = 11299276800.

The previous prime is 13218071983. The next prime is 13218072011. The reversal of 13218071999 is 99917081231.

It is a cyclic number.

It is not a de Polignac number, because 13218071999 - 2⁴ = 13218071983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13218071099) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 177239 + ... + 240519.

It is an arithmetic number, because the mean of its divisors is an integer number (955115226).

Almost surely, 2^13218071999 is an apocalyptic number.

13218071999 is a deficient number, since it is larger than the sum of its proper divisors (2063771617).

13218071999 is a wasteful number, since it uses less digits than its factorization.

13218071999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64426.

The product of its (nonzero) digits is 244944, while the sum is 50.

The spelling of 13218071999 in words is "thirteen billion, two hundred eighteen million, seventy-one thousand, nine hundred ninety-nine".