12111112111212 has 36 divisors (see below), whose sum is σ = 30617298621000. Its totient is φ = 4036628768832.

The previous prime is 12111112111183. The next prime is 12111112111271. The reversal of 12111112111212 is 21211121111121.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×12111112111212² (a number of 27 digits) contains 22 as substring.

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

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16664337 + ... + 17375912.

It is an arithmetic number, because the mean of its divisors is an integer number (850480517250).

Almost surely, 2^{12111112111212} is an apocalyptic number.

12111112111212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12111112111212 is an abundant number, since it is smaller than the sum of its proper divisors (18506186509788).

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

12111112111212 is a wasteful number, since it uses less digits than its factorization.

12111112111212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34050142 (or 34050137 counting only the distinct ones).

The product of its digits is 16, while the sum is 18.

Adding to 12111112111212 its reverse (21211121111121), we get a palindrome (33322233222333).

The spelling of 12111112111212 in words is "twelve trillion, one hundred eleven billion, one hundred twelve million, one hundred eleven thousand, two hundred twelve".