21710660499 has 16 divisors (see below), whose sum is σ = 35087936640. Its totient is φ = 13157975880.

The previous prime is 21710660443. The next prime is 21710660527. The reversal of 21710660499 is 99406601712.

21710660499 is a `hidden beast` number, since 21 + 7 + 10 + 6 + 604 + 9 + 9 = 666.

It is not a de Polignac number, because 21710660499 - 2⁷ = 21710660371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21710660429) 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, 36549637 + ... + 36550230.

It is an arithmetic number, because the mean of its divisors is an integer number (2192996040).

Almost surely, 2^21710660499 is an apocalyptic number.

21710660499 is a deficient number, since it is larger than the sum of its proper divisors (13377276141).

21710660499 is a wasteful number, since it uses less digits than its factorization.

21710660499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73099887 (or 73099881 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The spelling of 21710660499 in words is "twenty-one billion, seven hundred ten million, six hundred sixty thousand, four hundred ninety-nine".