22013209 has 2 divisors, whose sum is σ = 22013210. Its totient is φ = 22013208.

The previous prime is 22013203. The next prime is 22013221. The reversal of 22013209 is 90231022.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21483225 + 529984 = 4635^2 + 728^2 .

It is a cyclic number.

It is not a de Polignac number, because 22013209 - 2⁷ = 22013081 is a prime.

It is not a weakly prime, because it can be changed into another prime (22013203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11006604 + 11006605.

It is an arithmetic number, because the mean of its divisors is an integer number (11006605).

Almost surely, 2^22013209 is an apocalyptic number.

It is an amenable number.

22013209 is a deficient number, since it is larger than the sum of its proper divisors (1).

22013209 is an equidigital number, since it uses as much as digits as its factorization.

22013209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 22013209 is about 4691.8236326614. The cubic root of 22013209 is about 280.2600008421.

It can be divided in two parts, 22013 and 209, that added together give a palindrome (22222).

The spelling of 22013209 in words is "twenty-two million, thirteen thousand, two hundred nine".