22011021209 has 2 divisors, whose sum is σ = 22011021210. Its totient is φ = 22011021208.

The previous prime is 22011021187. The next prime is 22011021217. The reversal of 22011021209 is 90212011022.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21773953600 + 237067609 = 147560^2 + 15397^2 .

It is a cyclic number.

It is not a de Polignac number, because 22011021209 - 2¹² = 22011017113 is a prime.

It is not a weakly prime, because it can be changed into another prime (22011021289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11005510604 + 11005510605.

It is an arithmetic number, because the mean of its divisors is an integer number (11005510605).

Almost surely, 2^22011021209 is an apocalyptic number.

It is an amenable number.

22011021209 is a deficient number, since it is larger than the sum of its proper divisors (1).

22011021209 is an equidigital number, since it uses as much as digits as its factorization.

22011021209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 22011021209 in words is "twenty-two billion, eleven million, twenty-one thousand, two hundred nine".