111221443 has 4 divisors (see below), whose sum is σ = 111245400. Its totient is φ = 111197488.

The previous prime is 111221441. The next prime is 111221477. The reversal of 111221443 is 344122111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 111221443 - 2¹ = 111221441 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 111221443.

It is not an unprimeable number, because it can be changed into a prime (111221441) 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, 2530 + ... + 15127.

It is an arithmetic number, because the mean of its divisors is an integer number (27811350).

Almost surely, 2^111221443 is an apocalyptic number.

111221443 is a deficient number, since it is larger than the sum of its proper divisors (23957).

111221443 is an equidigital number, since it uses as much as digits as its factorization.

111221443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23956.

The product of its digits is 192, while the sum is 19.

The square root of 111221443 is about 10546.1577363512. The cubic root of 111221443 is about 480.9089302475.

Adding to 111221443 its reverse (344122111), we get a palindrome (455343554).

The spelling of 111221443 in words is "one hundred eleven million, two hundred twenty-one thousand, four hundred forty-three".