111221423 has 4 divisors (see below), whose sum is σ = 111836088. Its totient is φ = 110606760.

The previous prime is 111221419. The next prime is 111221437. The reversal of 111221423 is 324122111.

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 111221423 - 2² = 111221419 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 (111221023) 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, 307061 + ... + 307422.

It is an arithmetic number, because the mean of its divisors is an integer number (27959022).

Almost surely, 2^111221423 is an apocalyptic number.

111221423 is a deficient number, since it is larger than the sum of its proper divisors (614665).

111221423 is an equidigital number, since it uses as much as digits as its factorization.

111221423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614664.

The product of its digits is 96, while the sum is 17.

The square root of 111221423 is about 10546.1567881385. The cubic root of 111221423 is about 480.9089014215.

Adding to 111221423 its reverse (324122111), we get a palindrome (435343534).

The spelling of 111221423 in words is "one hundred eleven million, two hundred twenty-one thousand, four hundred twenty-three".