21626510055599 has 2 divisors, whose sum is σ = 21626510055600. Its totient is φ = 21626510055598.

The previous prime is 21626510055581. The next prime is 21626510055607. The reversal of 21626510055599 is 99555001562612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21626510055599 - 2²⁸ = 21626241620143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21626510055299) 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, 10813255027799 + 10813255027800.

It is an arithmetic number, because the mean of its divisors is an integer number (10813255027800).

Almost surely, 2^{21626510055599} is an apocalyptic number.

21626510055599 is a deficient number, since it is larger than the sum of its proper divisors (1).

21626510055599 is an equidigital number, since it uses as much as digits as its factorization.

21626510055599 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7290000, while the sum is 56.

The spelling of 21626510055599 in words is "twenty-one trillion, six hundred twenty-six billion, five hundred ten million, fifty-five thousand, five hundred ninety-nine".