12221209 has 32 divisors (see below), whose sum is σ = 17015040. Its totient is φ = 8467200.

The previous prime is 12221207. The next prime is 12221233. The reversal of 12221209 is 90212221.

It is not a de Polignac number, because 12221209 - 2¹ = 12221207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12221203) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28819 + ... + 29239.

It is an arithmetic number, because the mean of its divisors is an integer number (531720).

Almost surely, 2^12221209 is an apocalyptic number.

It is an amenable number.

12221209 is a deficient number, since it is larger than the sum of its proper divisors (4793831).

12221209 is a wasteful number, since it uses less digits than its factorization.

12221209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 12221209 is about 3495.8845804746. The cubic root of 12221209 is about 230.3410755569.

The spelling of 12221209 in words is "twelve million, two hundred twenty-one thousand, two hundred nine".