12729217218 has 16 divisors (see below), whose sum is σ = 25473439200. Its totient is φ = 4240571616.

The previous prime is 12729217217. The next prime is 12729217231. The reversal of 12729217218 is 81271292721.

It is a happy number.

12729217218 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 12729217218.

It is not an unprimeable number, because it can be changed into a prime (12729217213) 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 7 ways as a sum of consecutive naturals, for example, 614155 + ... + 634542.

It is an arithmetic number, because the mean of its divisors is an integer number (1592089950).

Almost surely, 2^12729217218 is an apocalyptic number.

12729217218 is an abundant number, since it is smaller than the sum of its proper divisors (12744221982).

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

12729217218 is a wasteful number, since it uses less digits than its factorization.

12729217218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1250401.

The product of its digits is 56448, while the sum is 42.

The spelling of 12729217218 in words is "twelve billion, seven hundred twenty-nine million, two hundred seventeen thousand, two hundred eighteen".