22213909 has 2 divisors, whose sum is σ = 22213910. Its totient is φ = 22213908.

The previous prime is 22213903. The next prime is 22213921. The reversal of 22213909 is 90931222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22061809 + 152100 = 4697^2 + 390^2 .

It is a cyclic number.

It is not a de Polignac number, because 22213909 - 2⁹ = 22213397 is a prime.

It is a Chen prime.

It is a nialpdrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22213903) 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 as a sum of consecutive naturals, namely, 11106954 + 11106955.

It is an arithmetic number, because the mean of its divisors is an integer number (11106955).

Almost surely, 2^22213909 is an apocalyptic number.

It is an amenable number.

22213909 is a deficient number, since it is larger than the sum of its proper divisors (1).

22213909 is an equidigital number, since it uses as much as digits as its factorization.

22213909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 22213909 is about 4713.1633750593. The cubic root of 22213909 is about 281.1091591788.

The spelling of 22213909 in words is "twenty-two million, two hundred thirteen thousand, nine hundred nine".