21460856065 has 8 divisors (see below), whose sum is σ = 28094211648. Its totient is φ = 15607895280.

The previous prime is 21460856029. The next prime is 21460856119. The reversal of 21460856065 is 56065806412.

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

It is not a de Polignac number, because 21460856065 - 2¹¹ = 21460854017 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, 195098637 + ... + 195098746.

It is an arithmetic number, because the mean of its divisors is an integer number (3511776456).

Almost surely, 2^21460856065 is an apocalyptic number.

It is an amenable number.

21460856065 is a deficient number, since it is larger than the sum of its proper divisors (6633355583).

21460856065 is a wasteful number, since it uses less digits than its factorization.

21460856065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390197399.

The product of its (nonzero) digits is 345600, while the sum is 43.

The spelling of 21460856065 in words is "twenty-one billion, four hundred sixty million, eight hundred fifty-six thousand, sixty-five".