111221121222 has 40 divisors (see below), whose sum is σ = 250890354000. Its totient is φ = 36824882256.

The previous prime is 111221121203. The next prime is 111221121223. The reversal of 111221121222 is 222121122111.

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 = 111221121195 and 111221121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221121223) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2279722 + ... + 2327997.

It is an arithmetic number, because the mean of its divisors is an integer number (6272258850).

Almost surely, 2^111221121222 is an apocalyptic number.

111221121222 is an abundant number, since it is smaller than the sum of its proper divisors (139669232778).

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

111221121222 is a wasteful number, since it uses less digits than its factorization.

111221121222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4607882 (or 4607873 counting only the distinct ones).

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

Adding to 111221121222 its reverse (222121122111), we get a palindrome (333342243333).

The spelling of 111221121222 in words is "one hundred eleven billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty-two".