21710660565 has 64 divisors (see below), whose sum is σ = 38708243712. Its totient is φ = 10301491200.

The previous prime is 21710660563. The next prime is 21710660567. The reversal of 21710660565 is 56506601712.

It is an interprime number because it is at equal distance from previous prime (21710660563) and next prime (21710660567).

It is not a de Polignac number, because 21710660565 - 2¹ = 21710660563 is a prime.

It is a super-2 number, since 2×21710660565² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21710660563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3678697 + ... + 3684593.

It is an arithmetic number, because the mean of its divisors is an integer number (604816308).

Almost surely, 2^21710660565 is an apocalyptic number.

It is an amenable number.

21710660565 is a deficient number, since it is larger than the sum of its proper divisors (16997583147).

21710660565 is a wasteful number, since it uses less digits than its factorization.

21710660565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6390.

The product of its (nonzero) digits is 75600, while the sum is 39.

The spelling of 21710660565 in words is "twenty-one billion, seven hundred ten million, six hundred sixty thousand, five hundred sixty-five".