12311312216 has 64 divisors (see below), whose sum is σ = 27120052800. Its totient is φ = 5128814592.

The previous prime is 12311312207. The next prime is 12311312353. The reversal of 12311312216 is 61221311321.

It is a junction number, because it is equal to n+sod(n) for n = 12311312191 and 12311312200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2917340 + ... + 2921556.

It is an arithmetic number, because the mean of its divisors is an integer number (423750825).

Almost surely, 2^12311312216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12311312216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13560026400).

12311312216 is an abundant number, since it is smaller than the sum of its proper divisors (14808740584).

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

12311312216 is a wasteful number, since it uses less digits than its factorization.

12311312216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5676 (or 5672 counting only the distinct ones).

The product of its digits is 432, while the sum is 23.

Adding to 12311312216 its reverse (61221311321), we get a palindrome (73532623537).

The spelling of 12311312216 in words is "twelve billion, three hundred eleven million, three hundred twelve thousand, two hundred sixteen".