12111135512 has 64 divisors (see below), whose sum is σ = 27542592000. Its totient is φ = 4873867776.

The previous prime is 12111135481. The next prime is 12111135551. The reversal of 12111135512 is 21553111121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 403439 + ... + 432417.

It is an arithmetic number, because the mean of its divisors is an integer number (430353000).

Almost surely, 2^12111135512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12111135512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13771296000).

12111135512 is an abundant number, since it is smaller than the sum of its proper divisors (15431456488).

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

12111135512 is a wasteful number, since it uses less digits than its factorization.

12111135512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29448 (or 29444 counting only the distinct ones).

The product of its digits is 300, while the sum is 23.

Adding to 12111135512 its reverse (21553111121), we get a palindrome (33664246633).

The spelling of 12111135512 in words is "twelve billion, one hundred eleven million, one hundred thirty-five thousand, five hundred twelve".