21440500265 has 16 divisors (see below), whose sum is σ = 25785781056. Its totient is φ = 17114328000.

The previous prime is 21440500253. The next prime is 21440500337. The reversal of 21440500265 is 56200504412.

It is a de Polignac number, because none of the positive numbers 2^k-21440500265 is a prime.

It is a super-2 number, since 2×21440500265² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5565590 + ... + 5569440.

It is an arithmetic number, because the mean of its divisors is an integer number (1611611316).

Almost surely, 2^21440500265 is an apocalyptic number.

It is an amenable number.

21440500265 is a deficient number, since it is larger than the sum of its proper divisors (4345280791).

21440500265 is a wasteful number, since it uses less digits than its factorization.

21440500265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6040.

The product of its (nonzero) digits is 9600, while the sum is 29.

The spelling of 21440500265 in words is "twenty-one billion, four hundred forty million, five hundred thousand, two hundred sixty-five".