111111113212 has 96 divisors (see below), whose sum is σ = 228012974784. Its totient is φ = 46813593600.

The previous prime is 111111113171. The next prime is 111111113219. The reversal of 111111113212 is 212311111111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111113219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55749688 + ... + 55751680.

It is an arithmetic number, because the mean of its divisors is an integer number (2375135154).

Almost surely, 2^111111113212 is an apocalyptic number.

It is an amenable number.

111111113212 is an abundant number, since it is smaller than the sum of its proper divisors (116901861572).

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

111111113212 is a wasteful number, since it uses less digits than its factorization.

111111113212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3119 (or 3117 counting only the distinct ones).

The product of its digits is 12, while the sum is 16.

Adding to 111111113212 its reverse (212311111111), we get a palindrome (323422224323).

The spelling of 111111113212 in words is "one hundred eleven billion, one hundred eleven million, one hundred thirteen thousand, two hundred twelve".