111221121209 has 16 divisors (see below), whose sum is σ = 124592608896. Its totient is φ = 98427225600.

The previous prime is 111221121203. The next prime is 111221121223. The reversal of 111221121209 is 902121122111.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-111221121209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111221121203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 789317 + ... + 919490.

It is an arithmetic number, because the mean of its divisors is an integer number (7787038056).

Almost surely, 2^111221121209 is an apocalyptic number.

It is an amenable number.

111221121209 is a deficient number, since it is larger than the sum of its proper divisors (13371487687).

111221121209 is a wasteful number, since it uses less digits than its factorization.

111221121209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1708976.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 111221121209 in words is "one hundred eleven billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred nine".