111121212222 has 96 divisors (see below), whose sum is σ = 250577911584. Its totient is φ = 35559648000.

The previous prime is 111121212221. The next prime is 111121212253. The reversal of 111121212222 is 222212121111.

111121212222 is a `hidden beast` number, since 111 + 121 + 212 + 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 = 111121212195 and 111121212204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111121212221) 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 47 ways as a sum of consecutive naturals, for example, 20647972 + ... + 20653352.

It is an arithmetic number, because the mean of its divisors is an integer number (2610186579).

Almost surely, 2^111121212222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 111121212222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125288955792).

111121212222 is an abundant number, since it is smaller than the sum of its proper divisors (139456699362).

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

111121212222 is a wasteful number, since it uses less digits than its factorization.

111121212222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5834 (or 5831 counting only the distinct ones).

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

Adding to 111121212222 its reverse (222212121111), we get a palindrome (333333333333).

The spelling of 111121212222 in words is "one hundred eleven billion, one hundred twenty-one million, two hundred twelve thousand, two hundred twenty-two".