111221122212 has 72 divisors (see below), whose sum is σ = 291390099000. Its totient is φ = 35740735488.

The previous prime is 111221122193. The next prime is 111221122237. The reversal of 111221122212 is 212221122111.

111221122212 is a `hidden beast` number, since 111 + 221 + 122 + 212 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 21997042596 + 89224079616 = 148314^2 + 298704^2 .

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

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 23 ways as a sum of consecutive naturals, for example, 237837 + ... + 528212.

Almost surely, 2^111221122212 is an apocalyptic number.

111221122212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

111221122212 is an abundant number, since it is smaller than the sum of its proper divisors (180168976788).

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

111221122212 is a wasteful number, since it uses less digits than its factorization.

111221122212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766205 (or 766200 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

Adding to 111221122212 its reverse (212221122111), we get a palindrome (323442244323).

The spelling of 111221122212 in words is "one hundred eleven billion, two hundred twenty-one million, one hundred twenty-two thousand, two hundred twelve".