21707115065 has 8 divisors (see below), whose sum is σ = 26415419328. Its totient is φ = 17121104560.

The previous prime is 21707115043. The next prime is 21707115083. The reversal of 21707115065 is 56051170712.

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

It is not a de Polignac number, because 21707115065 - 2⁸ = 21707114809 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, 30573047 + ... + 30573756.

It is an arithmetic number, because the mean of its divisors is an integer number (3301927416).

Almost surely, 2^21707115065 is an apocalyptic number.

It is an amenable number.

21707115065 is a deficient number, since it is larger than the sum of its proper divisors (4708304263).

21707115065 is an equidigital number, since it uses as much as digits as its factorization.

21707115065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61146879.

The product of its (nonzero) digits is 14700, while the sum is 35.

Adding to 21707115065 its reverse (56051170712), we get a palindrome (77758285777).

The spelling of 21707115065 in words is "twenty-one billion, seven hundred seven million, one hundred fifteen thousand, sixty-five".