321224009 has 4 divisors (see below), whose sum is σ = 322838400. Its totient is φ = 319609620.

The previous prime is 321223997. The next prime is 321224023. The reversal of 321224009 is 900422123.

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, and also an emirpimes, since its reverse is a distinct semiprime: 900422123 = 139 ⋅6477857.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321224009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321224069) 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, 806897 + ... + 807294.

It is an arithmetic number, because the mean of its divisors is an integer number (80709600).

Almost surely, 2^321224009 is an apocalyptic number.

It is an amenable number.

321224009 is a deficient number, since it is larger than the sum of its proper divisors (1614391).

321224009 is a wasteful number, since it uses less digits than its factorization.

321224009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1614390.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 321224009 is about 17922.7232584783. The cubic root of 321224009 is about 684.8613632445.

The spelling of 321224009 in words is "three hundred twenty-one million, two hundred twenty-four thousand, nine".