111221233221 has 16 divisors (see below), whose sum is σ = 169982893184. Its totient is φ = 63366395904.

The previous prime is 111221233217. The next prime is 111221233243. The reversal of 111221233221 is 122332122111.

It is not a de Polignac number, because 111221233221 - 2² = 111221233217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221233021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7850860 + ... + 7865013.

It is an arithmetic number, because the mean of its divisors is an integer number (10623930824).

Almost surely, 2^111221233221 is an apocalyptic number.

It is an amenable number.

111221233221 is a deficient number, since it is larger than the sum of its proper divisors (58761659963).

111221233221 is a wasteful number, since it uses less digits than its factorization.

111221233221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15716220.

The product of its digits is 288, while the sum is 21.

Adding to 111221233221 its reverse (122332122111), we get a palindrome (233553355332).

The spelling of 111221233221 in words is "one hundred eleven billion, two hundred twenty-one million, two hundred thirty-three thousand, two hundred twenty-one".