111212112012 has 24 divisors (see below), whose sum is σ = 262621375296. Its totient is φ = 36624068688.

The previous prime is 111212111999. The next prime is 111212112049. The reversal of 111212112012 is 210211212111.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 111212111982 and 111212112000.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55828378 + ... + 55830369.

It is an arithmetic number, because the mean of its divisors is an integer number (10942557304).

Almost surely, 2^111212112012 is an apocalyptic number.

111212112012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

111212112012 is an abundant number, since it is smaller than the sum of its proper divisors (151409263284).

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

111212112012 is a wasteful number, since it uses less digits than its factorization.

111212112012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111658837 (or 111658835 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 111212112012 its reverse (210211212111), we get a palindrome (321423324123).

The spelling of 111212112012 in words is "one hundred eleven billion, two hundred twelve million, one hundred twelve thousand, twelve".