111211221010212 has 18 divisors (see below), whose sum is σ = 281117253109238. Its totient is φ = 37070407003392.

The previous prime is 111211221010163. The next prime is 111211221010231. The reversal of 111211221010212 is 212010122112111.

It is a happy number.

111211221010212 is a `hidden beast` number, since 1 + 11 + 211 + 221 + 0 + 10 + 212 = 666.

It can be written as a sum of positive squares in only one way, i.e., 104616566194176 + 6594654816036 = 10228224^2 + 2568006^2 .

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

It is a super-3 number, since 3×111211221010212³ (a number of 43 digits) contains 333 as substring.

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

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, 1544600291773 + ... + 1544600291844.

Almost surely, 2^{111211221010212} is an apocalyptic number.

111211221010212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

111211221010212 is an abundant number, since it is smaller than the sum of its proper divisors (169906032099026).

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

111211221010212 is a wasteful number, since it uses less digits than its factorization.

111211221010212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3089200583627 (or 3089200583622 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 111211221010212 its reverse (212010122112111), we get a palindrome (323221343122323).

The spelling of 111211221010212 in words is "one hundred eleven trillion, two hundred eleven billion, two hundred twenty-one million, ten thousand, two hundred twelve".