111221323311 has 16 divisors (see below), whose sum is σ = 179449530624. Its totient is φ = 59816509824.

The previous prime is 111221323309. The next prime is 111221323327. The reversal of 111221323311 is 113323122111.

It is not a de Polignac number, because 111221323311 - 2¹ = 111221323309 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221323331) 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, 155771805 + ... + 155772518.

It is an arithmetic number, because the mean of its divisors is an integer number (11215595664).

Almost surely, 2^111221323311 is an apocalyptic number.

111221323311 is a deficient number, since it is larger than the sum of its proper divisors (68228207313).

111221323311 is a wasteful number, since it uses less digits than its factorization.

111221323311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311544350.

The product of its digits is 216, while the sum is 21.

Adding to 111221323311 its reverse (113323122111), we get a palindrome (224544445422).

The spelling of 111221323311 in words is "one hundred eleven billion, two hundred twenty-one million, three hundred twenty-three thousand, three hundred eleven".