111011111212212 has 36 divisors (see below), whose sum is σ = 280620006210180. Its totient is φ = 37002571491072.

The previous prime is 111011111212207. The next prime is 111011111212241. The reversal of 111011111212212 is 212212111110111.

It can be written as a sum of positive squares in 2 ways, for example, as 9481989952656 + 101529121259556 = 3079284^2 + 10076166^2 .

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

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

It is a congruent number.

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, 45983637 + ... + 48337532.

It is an arithmetic number, because the mean of its divisors is an integer number (7795000172505).

Almost surely, 2^{111011111212212} is an apocalyptic number.

111011111212212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

111011111212212 is an abundant number, since it is smaller than the sum of its proper divisors (169608894997968).

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

111011111212212 is a wasteful number, since it uses less digits than its factorization.

111011111212212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94353872 (or 94353867 counting only the distinct ones).

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

Adding to 111011111212212 its reverse (212212111110111), we get a palindrome (323223222322323).

The spelling of 111011111212212 in words is "one hundred eleven trillion, eleven billion, one hundred eleven million, two hundred twelve thousand, two hundred twelve".