111144221 has 4 divisors (see below), whose sum is σ = 112483392. Its totient is φ = 109805052.

The previous prime is 111144203. The next prime is 111144227. The reversal of 111144221 is 122441111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 111144221 - 2⁶ = 111144157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111144221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111144227) 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, 669461 + ... + 669626.

It is an arithmetic number, because the mean of its divisors is an integer number (28120848).

Almost surely, 2^111144221 is an apocalyptic number.

It is an amenable number.

111144221 is a deficient number, since it is larger than the sum of its proper divisors (1339171).

111144221 is an equidigital number, since it uses as much as digits as its factorization.

111144221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1339170.

The product of its digits is 64, while the sum is 17.

The square root of 111144221 is about 10542.4959568406. The cubic root of 111144221 is about 480.7976047497.

Adding to 111144221 its reverse (122441111), we get a palindrome (233585332).

The spelling of 111144221 in words is "one hundred eleven million, one hundred forty-four thousand, two hundred twenty-one".