111221022111 has 16 divisors (see below), whose sum is σ = 154005256800. Its totient is φ = 71311966208.

The previous prime is 111221022089. The next prime is 111221022113. The reversal of 111221022111 is 111220122111.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 111221022111 - 2⁶ = 111221022047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221022113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2464806 + ... + 2509523.

It is an arithmetic number, because the mean of its divisors is an integer number (9625328550).

Almost surely, 2^111221022111 is an apocalyptic number.

111221022111 is a deficient number, since it is larger than the sum of its proper divisors (42784234689).

111221022111 is a wasteful number, since it uses less digits than its factorization.

111221022111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4974618.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 111221022111 its reverse (111220122111), we get a palindrome (222441144222).

The spelling of 111221022111 in words is "one hundred eleven billion, two hundred twenty-one million, twenty-two thousand, one hundred eleven".