111222021222 has 24 divisors (see below), whose sum is σ = 259518050064. Its totient is φ = 34222160304.

The previous prime is 111222021199. The next prime is 111222021223. The reversal of 111222021222 is 222120222111.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 111222021195 and 111222021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111222021223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 237653658 + ... + 237654125.

It is an arithmetic number, because the mean of its divisors is an integer number (10813252086).

Almost surely, 2^111222021222 is an apocalyptic number.

111222021222 is an abundant number, since it is smaller than the sum of its proper divisors (148296028842).

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

111222021222 is a wasteful number, since it uses less digits than its factorization.

111222021222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475307804 (or 475307801 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 111222021222 its reverse (222120222111), we get a palindrome (333342243333).

The spelling of 111222021222 in words is "one hundred eleven billion, two hundred twenty-two million, twenty-one thousand, two hundred twenty-two".