21744851305 has 8 divisors (see below), whose sum is σ = 26106183432. Its totient is φ = 17387639808.

The previous prime is 21744851269. The next prime is 21744851393. The reversal of 21744851305 is 50315844712.

It can be written as a sum of positive squares in 4 ways, for example, as 2299106601 + 19445744704 = 47949^2 + 139448^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21744851305 - 2²³ = 21736462697 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1018534 + ... + 1039663.

It is an arithmetic number, because the mean of its divisors is an integer number (3263272929).

Almost surely, 2^21744851305 is an apocalyptic number.

It is an amenable number.

21744851305 is a deficient number, since it is larger than the sum of its proper divisors (4361332127).

21744851305 is a wasteful number, since it uses less digits than its factorization.

21744851305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2060315.

The product of its (nonzero) digits is 134400, while the sum is 40.

The spelling of 21744851305 in words is "twenty-one billion, seven hundred forty-four million, eight hundred fifty-one thousand, three hundred five".