221020320302209 has 2 divisors, whose sum is σ = 221020320302210. Its totient is φ = 221020320302208.

The previous prime is 221020320302101. The next prime is 221020320302219. The reversal of 221020320302209 is 902203023020122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 180171962524225 + 40848357777984 = 13422815^2 + 6391272^2 .

It is a cyclic number.

It is not a de Polignac number, because 221020320302209 - 2⁷ = 221020320302081 is a prime.

It is not a weakly prime, because it can be changed into another prime (221020320302219) 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, 110510160151104 + 110510160151105.

It is an arithmetic number, because the mean of its divisors is an integer number (110510160151105).

Almost surely, 2^{221020320302209} is an apocalyptic number.

It is an amenable number.

221020320302209 is a deficient number, since it is larger than the sum of its proper divisors (1).

221020320302209 is an equidigital number, since it uses as much as digits as its factorization.

221020320302209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 28.

The spelling of 221020320302209 in words is "two hundred twenty-one trillion, twenty billion, three hundred twenty million, three hundred two thousand, two hundred nine".