20536875221 has 2 divisors, whose sum is σ = 20536875222. Its totient is φ = 20536875220.

The previous prime is 20536875199. The next prime is 20536875251. The reversal of 20536875221 is 12257863502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17346207025 + 3190668196 = 131705^2 + 56486^2 .

It is a cyclic number.

It is not a de Polignac number, because 20536875221 - 2⁶ = 20536875157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20536875251) 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, 10268437610 + 10268437611.

It is an arithmetic number, because the mean of its divisors is an integer number (10268437611).

Almost surely, 2^20536875221 is an apocalyptic number.

It is an amenable number.

20536875221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20536875221 is an equidigital number, since it uses as much as digits as its factorization.

20536875221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 201600, while the sum is 41.

The spelling of 20536875221 in words is "twenty billion, five hundred thirty-six million, eight hundred seventy-five thousand, two hundred twenty-one".