111111211012212 has 18 divisors (see below), whose sum is σ = 280864450058738. Its totient is φ = 37037070337392.

The previous prime is 111111211012199. The next prime is 111111211012253. The reversal of 111111211012212 is 212210112111111.

It can be written as a sum of positive squares in only one way, i.e., 83462585837796 + 27648625174416 = 9135786^2 + 5258196^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×111111211012212² (a number of 29 digits) contains 22 as substring.

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 5 ways as a sum of consecutive naturals, for example, 1543211264023 + ... + 1543211264094.

Almost surely, 2^{111111211012212} is an apocalyptic number.

111111211012212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

111111211012212 is an abundant number, since it is smaller than the sum of its proper divisors (169753239046526).

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

111111211012212 is a wasteful number, since it uses less digits than its factorization.

111111211012212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3086422528127 (or 3086422528122 counting only the distinct ones).

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

Adding to 111111211012212 its reverse (212210112111111), we get a palindrome (323321323123323).

The spelling of 111111211012212 in words is "one hundred eleven trillion, one hundred eleven billion, two hundred eleven million, twelve thousand, two hundred twelve".