12218346388 has 12 divisors (see below), whose sum is σ = 21410357332. Its totient is φ = 6101101440.

The previous prime is 12218346353. The next prime is 12218346391. The reversal of 12218346388 is 88364381221.

It can be written as a sum of positive squares in 2 ways, for example, as 6528963204 + 5689383184 = 80802^2 + 75428^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2014533 + ... + 2020588.

Almost surely, 2^12218346388 is an apocalyptic number.

It is an amenable number.

12218346388 is a deficient number, since it is larger than the sum of its proper divisors (9192010944).

12218346388 is a wasteful number, since it uses less digits than its factorization.

12218346388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4035882 (or 4035880 counting only the distinct ones).

The product of its digits is 442368, while the sum is 46.

The spelling of 12218346388 in words is "twelve billion, two hundred eighteen million, three hundred forty-six thousand, three hundred eighty-eight".