21005320599589 has 2 divisors, whose sum is σ = 21005320599590. Its totient is φ = 21005320599588.

The previous prime is 21005320599563. The next prime is 21005320599643. The reversal of 21005320599589 is 98599502350012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17872880782689 + 3132439816900 = 4227633^2 + 1769870^2 .

It is a cyclic number.

It is not a de Polignac number, because 21005320599589 - 2¹³ = 21005320591397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21005320593589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10502660299794 + 10502660299795.

It is an arithmetic number, because the mean of its divisors is an integer number (10502660299795).

Almost surely, 2^{21005320599589} is an apocalyptic number.

It is an amenable number.

21005320599589 is a deficient number, since it is larger than the sum of its proper divisors (1).

21005320599589 is an equidigital number, since it uses as much as digits as its factorization.

21005320599589 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748000, while the sum is 58.

The spelling of 21005320599589 in words is "twenty-one trillion, five billion, three hundred twenty million, five hundred ninety-nine thousand, five hundred eighty-nine".