111221320111 has 4 divisors (see below), whose sum is σ = 121332349224. Its totient is φ = 101110291000.

The previous prime is 111221320109. The next prime is 111221320169. The reversal of 111221320111 is 111023122111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111023122111 = 11 ⋅10093011101.

It is a cyclic number.

It is not a de Polignac number, because 111221320111 - 2¹ = 111221320109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221320181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5055514540 + ... + 5055514561.

It is an arithmetic number, because the mean of its divisors is an integer number (30333087306).

Almost surely, 2^111221320111 is an apocalyptic number.

111221320111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111221320111 is a deficient number, since it is larger than the sum of its proper divisors (10111029113).

111221320111 is a wasteful number, since it uses less digits than its factorization.

111221320111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10111029112.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 111221320111 its reverse (111023122111), we get a palindrome (222244442222).

The spelling of 111221320111 in words is "one hundred eleven billion, two hundred twenty-one million, three hundred twenty thousand, one hundred eleven".