21606364259 has 2 divisors, whose sum is σ = 21606364260. Its totient is φ = 21606364258.

The previous prime is 21606364187. The next prime is 21606364261. The reversal of 21606364259 is 95246360612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21606364259 - 2²⁴ = 21589587043 is a prime.

Together with 21606364261, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21603364259) 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, 10803182129 + 10803182130.

It is an arithmetic number, because the mean of its divisors is an integer number (10803182130).

Almost surely, 2^21606364259 is an apocalyptic number.

21606364259 is a deficient number, since it is larger than the sum of its proper divisors (1).

21606364259 is an equidigital number, since it uses as much as digits as its factorization.

21606364259 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 44.

The spelling of 21606364259 in words is "twenty-one billion, six hundred six million, three hundred sixty-four thousand, two hundred fifty-nine".