20364102221 has 2 divisors, whose sum is σ = 20364102222. Its totient is φ = 20364102220.

The previous prime is 20364102197. The next prime is 20364102259. The reversal of 20364102221 is 12220146302.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13528946596 + 6835155625 = 116314^2 + 82675^2 .

It is a cyclic number.

It is not a de Polignac number, because 20364102221 - 2²⁶ = 20296993357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20364102721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10182051110 + 10182051111.

It is an arithmetic number, because the mean of its divisors is an integer number (10182051111).

Almost surely, 2^20364102221 is an apocalyptic number.

It is an amenable number.

20364102221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20364102221 is an equidigital number, since it uses as much as digits as its factorization.

20364102221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 20364102221 its reverse (12220146302), we get a palindrome (32584248523).

The spelling of 20364102221 in words is "twenty billion, three hundred sixty-four million, one hundred two thousand, two hundred twenty-one".