111221211222 has 24 divisors (see below), whose sum is σ = 262886499720. Its totient is φ = 33703397280.

The previous prime is 111221211209. The next prime is 111221211253. The reversal of 111221211222 is 222112122111.

111221211222 is a `hidden beast` number, since 1 + 11 + 221 + 211 + 222 = 666.

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 a junction number, because it is equal to n+sod(n) for n = 111221211195 and 111221211204.

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, 280861447 + ... + 280861842.

It is an arithmetic number, because the mean of its divisors is an integer number (10953604155).

Almost surely, 2^111221211222 is an apocalyptic number.

111221211222 is an abundant number, since it is smaller than the sum of its proper divisors (151665288498).

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

111221211222 is a wasteful number, since it uses less digits than its factorization.

111221211222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561723308 (or 561723305 counting only the distinct ones).

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

Adding to 111221211222 its reverse (222112122111), we get a palindrome (333333333333).

The spelling of 111221211222 in words is "one hundred eleven billion, two hundred twenty-one million, two hundred eleven thousand, two hundred twenty-two".