12155443212 has 48 divisors (see below), whose sum is σ = 30947616000. Its totient is φ = 3682695360.

The previous prime is 12155443193. The next prime is 12155443229. The reversal of 12155443212 is 21234455121.

It is a self number, because there is not a number n which added to its sum of digits gives 12155443212.

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 15 ways as a sum of consecutive naturals, for example, 1129714 + ... + 1140422.

It is an arithmetic number, because the mean of its divisors is an integer number (644742000).

Almost surely, 2^12155443212 is an apocalyptic number.

12155443212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12155443212 is an abundant number, since it is smaller than the sum of its proper divisors (18792172788).

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

12155443212 is a wasteful number, since it uses less digits than its factorization.

12155443212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19326 (or 19324 counting only the distinct ones).

The product of its digits is 9600, while the sum is 30.

Adding to 12155443212 its reverse (21234455121), we get a palindrome (33389898333).

The spelling of 12155443212 in words is "twelve billion, one hundred fifty-five million, four hundred forty-three thousand, two hundred twelve".