221030994809 has 2 divisors, whose sum is σ = 221030994810. Its totient is φ = 221030994808.

The previous prime is 221030994761. The next prime is 221030994829. The reversal of 221030994809 is 908499030122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116332155625 + 104698839184 = 341075^2 + 323572^2 .

It is a cyclic number.

It is not a de Polignac number, because 221030994809 - 2²⁰ = 221029946233 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (221030994829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110515497404 + 110515497405.

It is an arithmetic number, because the mean of its divisors is an integer number (110515497405).

Almost surely, 2^221030994809 is an apocalyptic number.

It is an amenable number.

221030994809 is a deficient number, since it is larger than the sum of its proper divisors (1).

221030994809 is an equidigital number, since it uses as much as digits as its factorization.

221030994809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 47.

The spelling of 221030994809 in words is "two hundred twenty-one billion, thirty million, nine hundred ninety-four thousand, eight hundred nine".