21604635005927 has 2 divisors, whose sum is σ = 21604635005928. Its totient is φ = 21604635005926.

The previous prime is 21604635005911. The next prime is 21604635006041. The reversal of 21604635005927 is 72950053640612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21604635005927 - 2⁴ = 21604635005911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21604635008927) 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, 10802317502963 + 10802317502964.

It is an arithmetic number, because the mean of its divisors is an integer number (10802317502964).

Almost surely, 2^{21604635005927} is an apocalyptic number.

21604635005927 is a deficient number, since it is larger than the sum of its proper divisors (1).

21604635005927 is an equidigital number, since it uses as much as digits as its factorization.

21604635005927 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2721600, while the sum is 50.

The spelling of 21604635005927 in words is "twenty-one trillion, six hundred four billion, six hundred thirty-five million, five thousand, nine hundred twenty-seven".