21550553205323 has 2 divisors, whose sum is σ = 21550553205324. Its totient is φ = 21550553205322.

The previous prime is 21550553205301. The next prime is 21550553205329. The reversal of 21550553205323 is 32350235505512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21550553205323 - 2⁴⁴ = 3958367160907 is a prime.

It is not a weakly prime, because it can be changed into another prime (21550553205329) 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, 10775276602661 + 10775276602662.

It is an arithmetic number, because the mean of its divisors is an integer number (10775276602662).

Almost surely, 2^{21550553205323} is an apocalyptic number.

21550553205323 is a deficient number, since it is larger than the sum of its proper divisors (1).

21550553205323 is an equidigital number, since it uses as much as digits as its factorization.

21550553205323 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 675000, while the sum is 41.

The spelling of 21550553205323 in words is "twenty-one trillion, five hundred fifty billion, five hundred fifty-three million, two hundred five thousand, three hundred twenty-three".