111212211212 has 12 divisors (see below), whose sum is σ = 197362516176. Its totient is φ = 54822920880.

The previous prime is 111212211161. The next prime is 111212211241. The reversal of 111212211212 is 212112212111.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 195795863 + ... + 195796430.

It is an arithmetic number, because the mean of its divisors is an integer number (16446876348).

Almost surely, 2^111212211212 is an apocalyptic number.

It is an amenable number.

111212211212 is a deficient number, since it is larger than the sum of its proper divisors (86150304964).

111212211212 is a wasteful number, since it uses less digits than its factorization.

111212211212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391592368 (or 391592366 counting only the distinct ones).

The product of its digits is 32, while the sum is 17.

Adding to 111212211212 its reverse (212112212111), we get a palindrome (323324423323).

The spelling of 111212211212 in words is "one hundred eleven billion, two hundred twelve million, two hundred eleven thousand, two hundred twelve".