23221209 has 8 divisors (see below), whose sum is σ = 33776352. Its totient is φ = 14073440.

The previous prime is 23221193. The next prime is 23221223. The reversal of 23221209 is 90212232.

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

It is a cyclic number.

It is not a de Polignac number, because 23221209 - 2⁴ = 23221193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23221259) 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 7 ways as a sum of consecutive naturals, for example, 351804 + ... + 351869.

It is an arithmetic number, because the mean of its divisors is an integer number (4222044).

Almost surely, 2^23221209 is an apocalyptic number.

It is an amenable number.

23221209 is a deficient number, since it is larger than the sum of its proper divisors (10555143).

23221209 is a wasteful number, since it uses less digits than its factorization.

23221209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 703687.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 23221209 is about 4818.8389680503. The cubic root of 23221209 is about 285.2955137312.

The spelling of 23221209 in words is "twenty-three million, two hundred twenty-one thousand, two hundred nine".