11112121209 has 16 divisors (see below), whose sum is σ = 17003612160. Its totient is φ = 6323212560.

The previous prime is 11112121201. The next prime is 11112121219. The reversal of 11112121209 is 90212121111.

11112121209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11112121209 - 2³ = 11112121201 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (11112121201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1101987 + ... + 1112024.

It is an arithmetic number, because the mean of its divisors is an integer number (1062725760).

Almost surely, 2^11112121209 is an apocalyptic number.

It is an amenable number.

11112121209 is a deficient number, since it is larger than the sum of its proper divisors (5891490951).

11112121209 is a wasteful number, since it uses less digits than its factorization.

11112121209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2214260.

The product of its (nonzero) digits is 72, while the sum is 21.

The spelling of 11112121209 in words is "eleven billion, one hundred twelve million, one hundred twenty-one thousand, two hundred nine".