21716340717 has 4 divisors (see below), whose sum is σ = 28955120960. Its totient is φ = 14477560476.

The previous prime is 21716340641. The next prime is 21716340749. The reversal of 21716340717 is 71704361712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21716340717 - 2²³ = 21707952109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21716340797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3619390117 + ... + 3619390122.

It is an arithmetic number, because the mean of its divisors is an integer number (7238780240).

Almost surely, 2^21716340717 is an apocalyptic number.

It is an amenable number.

21716340717 is a deficient number, since it is larger than the sum of its proper divisors (7238780243).

21716340717 is an equidigital number, since it uses as much as digits as its factorization.

21716340717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7238780242.

The product of its (nonzero) digits is 49392, while the sum is 39.

The spelling of 21716340717 in words is "twenty-one billion, seven hundred sixteen million, three hundred forty thousand, seven hundred seventeen".