16227821209 has 2 divisors, whose sum is σ = 16227821210. Its totient is φ = 16227821208.

The previous prime is 16227821191. The next prime is 16227821221. The reversal of 16227821209 is 90212872261.

16227821209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13410334809 + 2817486400 = 115803^2 + 53080^2 .

It is an emirp because it is prime and its reverse (90212872261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16227821209 - 2⁷ = 16227821081 is a prime.

It is not a weakly prime, because it can be changed into another prime (16227821809) 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, 8113910604 + 8113910605.

It is an arithmetic number, because the mean of its divisors is an integer number (8113910605).

Almost surely, 2^16227821209 is an apocalyptic number.

It is an amenable number.

16227821209 is a deficient number, since it is larger than the sum of its proper divisors (1).

16227821209 is an equidigital number, since it uses as much as digits as its factorization.

16227821209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 40.

The spelling of 16227821209 in words is "sixteen billion, two hundred twenty-seven million, eight hundred twenty-one thousand, two hundred nine".