111221409 has 24 divisors (see below), whose sum is σ = 165448192. Its totient is φ = 66064320.

The previous prime is 111221387. The next prime is 111221417. The reversal of 111221409 is 904122111.

It is a happy number.

It is not a de Polignac number, because 111221409 - 2⁵ = 111221377 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (111221419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31104 + ... + 34494.

Almost surely, 2^111221409 is an apocalyptic number.

It is an amenable number.

111221409 is a deficient number, since it is larger than the sum of its proper divisors (54226783).

111221409 is a wasteful number, since it uses less digits than its factorization.

111221409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3465 (or 3436 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 111221409 is about 10546.1561243896. The cubic root of 111221409 is about 480.9088812434.

The spelling of 111221409 in words is "one hundred eleven million, two hundred twenty-one thousand, four hundred nine".