21710005647 has 32 divisors (see below), whose sum is σ = 32963590656. Its totient is φ = 12580761600.

The previous prime is 21710005631. The next prime is 21710005699. The reversal of 21710005647 is 74650001712.

It is not a de Polignac number, because 21710005647 - 2⁴ = 21710005631 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21710005547) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3543747 + ... + 3549867.

It is an arithmetic number, because the mean of its divisors is an integer number (1030112208).

Almost surely, 2^21710005647 is an apocalyptic number.

21710005647 is a deficient number, since it is larger than the sum of its proper divisors (11253585009).

21710005647 is a wasteful number, since it uses less digits than its factorization.

21710005647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10831.

The product of its (nonzero) digits is 11760, while the sum is 33.

The spelling of 21710005647 in words is "twenty-one billion, seven hundred ten million, five thousand, six hundred forty-seven".