21716714709 has 10 divisors (see below), whose sum is σ = 32441018390. Its totient is φ = 14477809752.

The previous prime is 21716714693. The next prime is 21716714731. The reversal of 21716714709 is 90741761712.

21716714709 is a `hidden beast` number, since 2 + 17 + 167 + 1 + 470 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19795645809 + 1921068900 = 140697^2 + 43830^2 .

It is not a de Polignac number, because 21716714709 - 2⁴ = 21716714693 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21716713709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 134053714 + ... + 134053875.

It is an arithmetic number, because the mean of its divisors is an integer number (3244101839).

Almost surely, 2^21716714709 is an apocalyptic number.

It is an amenable number.

21716714709 is a deficient number, since it is larger than the sum of its proper divisors (10724303681).

21716714709 is an equidigital number, since it uses as much as digits as its factorization.

21716714709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268107601 (or 268107592 counting only the distinct ones).

The product of its (nonzero) digits is 148176, while the sum is 45.

The spelling of 21716714709 in words is "twenty-one billion, seven hundred sixteen million, seven hundred fourteen thousand, seven hundred nine".