12013212312 has 48 divisors (see below), whose sum is σ = 33087249000. Its totient is φ = 3936531456.

The previous prime is 12013212293. The next prime is 12013212377. The reversal of 12013212312 is 21321231021.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1409737 + ... + 1418232.

Almost surely, 2^12013212312 is an apocalyptic number.

12013212312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12013212312 is an abundant number, since it is smaller than the sum of its proper divisors (21074036688).

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

12013212312 is a wasteful number, since it uses less digits than its factorization.

12013212312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2828040 (or 2828033 counting only the distinct ones).

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

Adding to 12013212312 its reverse (21321231021), we get a palindrome (33334443333).

The spelling of 12013212312 in words is "twelve billion, thirteen million, two hundred twelve thousand, three hundred twelve".