21744052513 has 4 divisors (see below), whose sum is σ = 21749195968. Its totient is φ = 21738909060.

The previous prime is 21744052511. The next prime is 21744052541. The reversal of 21744052513 is 31525044712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21744052513 - 2¹ = 21744052511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21744052511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2565381 + ... + 2573842.

It is an arithmetic number, because the mean of its divisors is an integer number (5437298992).

Almost surely, 2^21744052513 is an apocalyptic number.

It is an amenable number.

21744052513 is a deficient number, since it is larger than the sum of its proper divisors (5143455).

21744052513 is an equidigital number, since it uses as much as digits as its factorization.

21744052513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5143454.

The product of its (nonzero) digits is 33600, while the sum is 34.

The spelling of 21744052513 in words is "twenty-one billion, seven hundred forty-four million, fifty-two thousand, five hundred thirteen".