21344744013535 has 16 divisors (see below), whose sum is σ = 25666641360000. Its totient is φ = 17040506297760.

The previous prime is 21344744013529. The next prime is 21344744013581. The reversal of 21344744013535 is 53531044744312.

It is not a de Polignac number, because 21344744013535 - 2⁹ = 21344744013023 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16345216 + ... + 17602714.

It is an arithmetic number, because the mean of its divisors is an integer number (1604165085000).

Almost surely, 2^{21344744013535} is an apocalyptic number.

21344744013535 is a deficient number, since it is larger than the sum of its proper divisors (4321897346465).

21344744013535 is a wasteful number, since it uses less digits than its factorization.

21344744013535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1264518.

The product of its (nonzero) digits is 2419200, while the sum is 46.

Adding to 21344744013535 its reverse (53531044744312), we get a palindrome (74875788757847).

The spelling of 21344744013535 in words is "twenty-one trillion, three hundred forty-four billion, seven hundred forty-four million, thirteen thousand, five hundred thirty-five".