21710660497 has 16 divisors (see below), whose sum is σ = 22522604544. Its totient is φ = 20905920000.

The previous prime is 21710660443. The next prime is 21710660527. The reversal of 21710660497 is 79406601712.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21710660497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21710660597) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8509372 + ... + 8511922.

It is an arithmetic number, because the mean of its divisors is an integer number (1407662784).

Almost surely, 2^21710660497 is an apocalyptic number.

It is an amenable number.

21710660497 is a deficient number, since it is larger than the sum of its proper divisors (811944047).

21710660497 is a wasteful number, since it uses less digits than its factorization.

21710660497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3840.

The product of its (nonzero) digits is 127008, while the sum is 43.

The spelling of 21710660497 in words is "twenty-one billion, seven hundred ten million, six hundred sixty thousand, four hundred ninety-seven".