12111515212212 has 72 divisors (see below), whose sum is σ = 32970979477800. Its totient is φ = 3726536014080.

The previous prime is 12111515212189. The next prime is 12111515212217. The reversal of 12111515212212 is 21221251511121.

12111515212212 is a `hidden beast` number, since 1 + 2 + 1 + 11 + 515 + 2 + 122 + 12 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1848936379536 + 10262578832676 = 1359756^2 + 3203526^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111515212217) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22355914 + ... + 22891262.

It is an arithmetic number, because the mean of its divisors is an integer number (457930270525).

Almost surely, 2^{12111515212212} is an apocalyptic number.

12111515212212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12111515212212 is an abundant number, since it is smaller than the sum of its proper divisors (20859464265588).

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

12111515212212 is a wasteful number, since it uses less digits than its factorization.

12111515212212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583713 (or 583708 counting only the distinct ones).

The product of its digits is 800, while the sum is 27.

Adding to 12111515212212 its reverse (21221251511121), we get a palindrome (33332766723333).

The spelling of 12111515212212 in words is "twelve trillion, one hundred eleven billion, five hundred fifteen million, two hundred twelve thousand, two hundred twelve".