22142209 has 4 divisors (see below), whose sum is σ = 22254804. Its totient is φ = 22029616.

The previous prime is 22142189. The next prime is 22142213. The reversal of 22142209 is 90224122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21594609 + 547600 = 4647^2 + 740^2 .

It is a cyclic number.

It is not a de Polignac number, because 22142209 - 2²³ = 13753601 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22142209.

It is not an unprimeable number, because it can be changed into a prime (22142299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56002 + ... + 56395.

It is an arithmetic number, because the mean of its divisors is an integer number (5563701).

Almost surely, 2^22142209 is an apocalyptic number.

It is an amenable number.

22142209 is a deficient number, since it is larger than the sum of its proper divisors (112595).

22142209 is a wasteful number, since it uses less digits than its factorization.

22142209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112594.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 22142209 is about 4705.5508710458. The cubic root of 22142209 is about 280.8063871473.

The spelling of 22142209 in words is "twenty-two million, one hundred forty-two thousand, two hundred nine".