22012009 has 4 divisors (see below), whose sum is σ = 22147216. Its totient is φ = 21876804.

The previous prime is 22011967. The next prime is 22012019. The reversal of 22012009 is 90021022.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 22012009 - 2⁷ = 22011881 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22011983 and 22012001.

It is not an unprimeable number, because it can be changed into a prime (22012019) 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 3 ways as a sum of consecutive naturals, for example, 67359 + ... + 67684.

It is an arithmetic number, because the mean of its divisors is an integer number (5536804).

Almost surely, 2^22012009 is an apocalyptic number.

It is an amenable number.

22012009 is a deficient number, since it is larger than the sum of its proper divisors (135207).

22012009 is a wasteful number, since it uses less digits than its factorization.

22012009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135206.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 22012009 is about 4691.6957488737. The cubic root of 22012009 is about 280.2549081708.

The spelling of 22012009 in words is "twenty-two million, twelve thousand, nine".