12221409 has 8 divisors (see below), whose sum is σ = 16820992. Its totient is φ = 7884720.

The previous prime is 12221401. The next prime is 12221413. The reversal of 12221409 is 90412221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12221409 - 2³ = 12221401 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 (12221401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65614 + ... + 65799.

It is an arithmetic number, because the mean of its divisors is an integer number (2102624).

Almost surely, 2^12221409 is an apocalyptic number.

It is an amenable number.

12221409 is a deficient number, since it is larger than the sum of its proper divisors (4599583).

12221409 is a wasteful number, since it uses less digits than its factorization.

12221409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131447.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 12221409 is about 3495.9131854209. The cubic root of 12221409 is about 230.3423320600.

The spelling of 12221409 in words is "twelve million, two hundred twenty-one thousand, four hundred nine".