12216322318 has 4 divisors (see below), whose sum is σ = 18324483480. Its totient is φ = 6108161158.

The previous prime is 12216322309. The next prime is 12216322333. The reversal of 12216322318 is 81322361221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81322361221 = 251 ⋅323993471.

It is a self number, because there is not a number n which added to its sum of digits gives 12216322318.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3054080578 + ... + 3054080581.

It is an arithmetic number, because the mean of its divisors is an integer number (4581120870).

Almost surely, 2^12216322318 is an apocalyptic number.

12216322318 is a deficient number, since it is larger than the sum of its proper divisors (6108161162).

12216322318 is an equidigital number, since it uses as much as digits as its factorization.

12216322318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6108161161.

The product of its digits is 6912, while the sum is 31.

Adding to 12216322318 its reverse (81322361221), we get a palindrome (93538683539).

The spelling of 12216322318 in words is "twelve billion, two hundred sixteen million, three hundred twenty-two thousand, three hundred eighteen".