12012123312 has 80 divisors (see below), whose sum is σ = 39404858880. Its totient is φ = 3432034368.

The previous prime is 12012123311. The next prime is 12012123367. The reversal of 12012123312 is 21332121021.

12012123312 is a `hidden beast` number, since 120 + 1 + 212 + 331 + 2 = 666.

It is a super-2 number, since 2×12012123312² (a number of 21 digits) contains 22 as substring.

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 (12012123311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1983108 + ... + 1989155.

It is an arithmetic number, because the mean of its divisors is an integer number (492560736).

Almost surely, 2^12012123312 is an apocalyptic number.

12012123312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12012123312 is an abundant number, since it is smaller than the sum of its proper divisors (27392735568).

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

12012123312 is a wasteful number, since it uses less digits than its factorization.

12012123312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3972287 (or 3972275 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 12012123312 its reverse (21332121021), we get a palindrome (33344244333).

The spelling of 12012123312 in words is "twelve billion, twelve million, one hundred twenty-three thousand, three hundred twelve".