12021209 has 8 divisors (see below), whose sum is σ = 12505152. Its totient is φ = 11546640.

The previous prime is 12021187. The next prime is 12021259. The reversal of 12021209 is 90212021.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12021209 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 (12021259) 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, 332 + ... + 4914.

It is an arithmetic number, because the mean of its divisors is an integer number (1563144).

Almost surely, 2^12021209 is an apocalyptic number.

It is an amenable number.

12021209 is a deficient number, since it is larger than the sum of its proper divisors (483943).

12021209 is an equidigital number, since it uses as much as digits as its factorization.

12021209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4687.

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

The square root of 12021209 is about 3467.1615191681. The cubic root of 12021209 is about 229.0776482614.

The spelling of 12021209 in words is "twelve million, twenty-one thousand, two hundred nine".