21715827265 has 16 divisors (see below), whose sum is σ = 28476463680. Its totient is φ = 15766400320.

The previous prime is 21715827253. The next prime is 21715827283. The reversal of 21715827265 is 56272851712.

It is a happy number.

It is not a de Polignac number, because 21715827265 - 2⁵ = 21715827233 is a prime.

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, 304030 + ... + 368599.

It is an arithmetic number, because the mean of its divisors is an integer number (1779778980).

Almost surely, 2^21715827265 is an apocalyptic number.

It is an amenable number.

21715827265 is a deficient number, since it is larger than the sum of its proper divisors (6760636415).

21715827265 is a wasteful number, since it uses less digits than its factorization.

21715827265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673232.

The product of its digits is 470400, while the sum is 46.

The spelling of 21715827265 in words is "twenty-one billion, seven hundred fifteen million, eight hundred twenty-seven thousand, two hundred sixty-five".