12111209 has 12 divisors (see below), whose sum is σ = 13458480. Its totient is φ = 10808160.

The previous prime is 12111199. The next prime is 12111217. The reversal of 12111209 is 90211121.

It is a de Polignac number, because none of the positive numbers 2^k-12111209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12111269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 87062 + ... + 87200.

It is an arithmetic number, because the mean of its divisors is an integer number (1121540).

Almost surely, 2^12111209 is an apocalyptic number.

It is an amenable number.

12111209 is a deficient number, since it is larger than the sum of its proper divisors (1347271).

12111209 is an equidigital number, since it uses as much as digits as its factorization.

12111209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328 (or 239 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 12111209 is about 3480.1162336911. The cubic root of 12111209 is about 229.6479111956.

The spelling of 12111209 in words is "twelve million, one hundred eleven thousand, two hundred nine".