12012222312 has 96 divisors (see below), whose sum is σ = 33955838280. Its totient is φ = 3832657920.

The previous prime is 12012222311. The next prime is 12012222319. The reversal of 12012222312 is 21322221021.

12012222312 is a `hidden beast` number, since 120 + 12 + 222 + 312 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 6243212196 + 5769010116 = 79014^2 + 75954^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (12012222311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 118068 + ... + 194844.

Almost surely, 2^12012222312 is an apocalyptic number.

12012222312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12012222312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16977919140).

12012222312 is an abundant number, since it is smaller than the sum of its proper divisors (21943615968).

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

12012222312 is a wasteful number, since it uses less digits than its factorization.

12012222312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76883 (or 76876 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 12012222312 its reverse (21322221021), we get a palindrome (33334443333).

The spelling of 12012222312 in words is "twelve billion, twelve million, two hundred twenty-two thousand, three hundred twelve".