21594890327 has 2 divisors, whose sum is σ = 21594890328. Its totient is φ = 21594890326.

The previous prime is 21594890267. The next prime is 21594890329. The reversal of 21594890327 is 72309849512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21594890327 - 2⁶ = 21594890263 is a prime.

Together with 21594890329, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21594890329) 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, 10797445163 + 10797445164.

It is an arithmetic number, because the mean of its divisors is an integer number (10797445164).

Almost surely, 2^21594890327 is an apocalyptic number.

21594890327 is a deficient number, since it is larger than the sum of its proper divisors (1).

21594890327 is an equidigital number, since it uses as much as digits as its factorization.

21594890327 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 21594890327 in words is "twenty-one billion, five hundred ninety-four million, eight hundred ninety thousand, three hundred twenty-seven".