21710713247 has 6 divisors (see below), whose sum is σ = 22128081192. Its totient is φ = 21301074392.

The previous prime is 21710713229. The next prime is 21710713249. The reversal of 21710713247 is 74231701712.

It is not a de Polignac number, because 21710713247 - 2²⁰ = 21709664671 is a prime.

It is a super-2 number, since 2×21710713247² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21710713249) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3861683 + ... + 3867300.

It is an arithmetic number, because the mean of its divisors is an integer number (3688013532).

Almost surely, 2^21710713247 is an apocalyptic number.

21710713247 is a deficient number, since it is larger than the sum of its proper divisors (417367945).

21710713247 is an frugal number, since it uses more digits than its factorization.

21710713247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7729089 (or 7729036 counting only the distinct ones).

The product of its (nonzero) digits is 16464, while the sum is 35.

The spelling of 21710713247 in words is "twenty-one billion, seven hundred ten million, seven hundred thirteen thousand, two hundred forty-seven".