20330345221 has 2 divisors, whose sum is σ = 20330345222. Its totient is φ = 20330345220.

The previous prime is 20330345209. The next prime is 20330345227. The reversal of 20330345221 is 12254303302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15180704100 + 5149641121 = 123210^2 + 71761^2 .

It is a cyclic number.

It is not a de Polignac number, because 20330345221 - 2⁷ = 20330345093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20330345227) 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, 10165172610 + 10165172611.

It is an arithmetic number, because the mean of its divisors is an integer number (10165172611).

Almost surely, 2^20330345221 is an apocalyptic number.

It is an amenable number.

20330345221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20330345221 is an equidigital number, since it uses as much as digits as its factorization.

20330345221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 25.

Adding to 20330345221 its reverse (12254303302), we get a palindrome (32584648523).

The spelling of 20330345221 in words is "twenty billion, three hundred thirty million, three hundred forty-five thousand, two hundred twenty-one".