111211211211212 has 12 divisors (see below), whose sum is σ = 222422422422480. Its totient is φ = 47661947661936.

The previous prime is 111211211211197. The next prime is 111211211211223. The reversal of 111211211211212 is 212112112112111.

111211211211212 is an admirable number.

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 3 ways as a sum of consecutive naturals, for example, 1985914485887 + ... + 1985914485942.

It is an arithmetic number, because the mean of its divisors is an integer number (18535201868540).

Almost surely, 2^{111211211211212} is an apocalyptic number.

It is an amenable number.

111211211211212 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

111211211211212 is a wasteful number, since it uses less digits than its factorization.

111211211211212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3971828971840 (or 3971828971838 counting only the distinct ones).

The product of its digits is 32, while the sum is 20.

Adding to 111211211211212 its reverse (212112112112111), we get a palindrome (323323323323323).

The spelling of 111211211211212 in words is "one hundred eleven trillion, two hundred eleven billion, two hundred eleven million, two hundred eleven thousand, two hundred twelve".