21317715005 has 16 divisors (see below), whose sum is σ = 25703529984. Its totient is φ = 16972796160.

The previous prime is 21317714993. The next prime is 21317715031. The reversal of 21317715005 is 50051771312.

It is not a de Polignac number, because 21317715005 - 2¹⁸ = 21317452861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1315784 + ... + 1331886.

It is an arithmetic number, because the mean of its divisors is an integer number (1606470624).

Almost surely, 2^21317715005 is an apocalyptic number.

It is an amenable number.

21317715005 is a deficient number, since it is larger than the sum of its proper divisors (4385814979).

21317715005 is a wasteful number, since it uses less digits than its factorization.

21317715005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17356.

The product of its (nonzero) digits is 7350, while the sum is 32.

The spelling of 21317715005 in words is "twenty-one billion, three hundred seventeen million, seven hundred fifteen thousand, five".