21724341265 has 32 divisors (see below), whose sum is σ = 28692351360. Its totient is φ = 15659443200.

The previous prime is 21724341217. The next prime is 21724341307. The reversal of 21724341265 is 56214342712.

It is not a de Polignac number, because 21724341265 - 2⁹ = 21724340753 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3117385 + ... + 3124345.

It is an arithmetic number, because the mean of its divisors is an integer number (896635980).

Almost surely, 2^21724341265 is an apocalyptic number.

It is an amenable number.

21724341265 is a deficient number, since it is larger than the sum of its proper divisors (6968010095).

21724341265 is a wasteful number, since it uses less digits than its factorization.

21724341265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7473.

The product of its digits is 80640, while the sum is 37.

Adding to 21724341265 its reverse (56214342712), we get a palindrome (77938683977).

The spelling of 21724341265 in words is "twenty-one billion, seven hundred twenty-four million, three hundred forty-one thousand, two hundred sixty-five".