22231221209 has 2 divisors, whose sum is σ = 22231221210. Its totient is φ = 22231221208.

The previous prime is 22231221203. The next prime is 22231221211. The reversal of 22231221209 is 90212213222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17711617225 + 4519603984 = 133085^2 + 67228^2 .

It is a cyclic number.

It is not a de Polignac number, because 22231221209 - 2⁸ = 22231220953 is a prime.

Together with 22231221211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22231221203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11115610604 + 11115610605.

It is an arithmetic number, because the mean of its divisors is an integer number (11115610605).

Almost surely, 2^22231221209 is an apocalyptic number.

It is an amenable number.

22231221209 is a deficient number, since it is larger than the sum of its proper divisors (1).

22231221209 is an equidigital number, since it uses as much as digits as its factorization.

22231221209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

The spelling of 22231221209 in words is "twenty-two billion, two hundred thirty-one million, two hundred twenty-one thousand, two hundred nine".