12219871818 has 32 divisors (see below), whose sum is σ = 30470330880. Its totient is φ = 3173992560.

The previous prime is 12219871817. The next prime is 12219871837. The reversal of 12219871818 is 81817891221.

12219871818 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (12219871817) 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, 13224508 + ... + 13225431.

It is an arithmetic number, because the mean of its divisors is an integer number (952197840).

Almost surely, 2^12219871818 is an apocalyptic number.

12219871818 is an abundant number, since it is smaller than the sum of its proper divisors (18250459062).

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

12219871818 is a wasteful number, since it uses less digits than its factorization.

12219871818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26449962.

The product of its digits is 129024, while the sum is 48.

The spelling of 12219871818 in words is "twelve billion, two hundred nineteen million, eight hundred seventy-one thousand, eight hundred eighteen".