22212209 has 4 divisors (see below), whose sum is σ = 22728816. Its totient is φ = 21695604.

The previous prime is 22212199. The next prime is 22212233. The reversal of 22212209 is 90221222.

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 22212209 - 2⁸ = 22211953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22212299) 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, 258239 + ... + 258324.

It is an arithmetic number, because the mean of its divisors is an integer number (5682204).

Almost surely, 2^22212209 is an apocalyptic number.

It is an amenable number.

22212209 is a deficient number, since it is larger than the sum of its proper divisors (516607).

22212209 is an equidigital number, since it uses as much as digits as its factorization.

22212209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516606.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 22212209 is about 4712.9830256431. The cubic root of 22212209 is about 281.1019880296.

The spelling of 22212209 in words is "twenty-two million, two hundred twelve thousand, two hundred nine".