21710660564 has 12 divisors (see below), whose sum is σ = 37995455988. Its totient is φ = 10854816000.

The previous prime is 21710660563. The next prime is 21710660567. The reversal of 21710660564 is 46506601712.

It can be written as a sum of positive squares in 2 ways, for example, as 19000416964 + 2710243600 = 137842^2 + 52060^2 .

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24167 + ... + 209774.

It is an arithmetic number, because the mean of its divisors is an integer number (3166287999).

Almost surely, 2^21710660564 is an apocalyptic number.

It is an amenable number.

21710660564 is a deficient number, since it is larger than the sum of its proper divisors (16284795424).

21710660564 is a wasteful number, since it uses less digits than its factorization.

21710660564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257146 (or 257144 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 38.

The spelling of 21710660564 in words is "twenty-one billion, seven hundred ten million, six hundred sixty thousand, five hundred sixty-four".