12210209 has 4 divisors (see below), whose sum is σ = 13320240. Its totient is φ = 11100180.

The previous prime is 12210203. The next prime is 12210221. The reversal of 12210209 is 90201221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12210209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12210203) 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, 554999 + ... + 555020.

It is an arithmetic number, because the mean of its divisors is an integer number (3330060).

Almost surely, 2^12210209 is an apocalyptic number.

It is an amenable number.

12210209 is a deficient number, since it is larger than the sum of its proper divisors (1110031).

12210209 is a wasteful number, since it uses less digits than its factorization.

12210209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1110030.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 12210209 is about 3494.3109478122. The cubic root of 12210209 is about 230.2719467606.

The spelling of 12210209 in words is "twelve million, two hundred ten thousand, two hundred nine".