21317715006 has 48 divisors (see below), whose sum is σ = 50348817792. Its totient is φ = 5894287920.

The previous prime is 21317714993. The next prime is 21317715031. The reversal of 21317715006 is 60051771312.

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 23 ways as a sum of consecutive naturals, for example, 223720 + ... + 304443.

It is an arithmetic number, because the mean of its divisors is an integer number (1048933704).

Almost surely, 2^21317715006 is an apocalyptic number.

21317715006 is an abundant number, since it is smaller than the sum of its proper divisors (29031102786).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21317715006 is a wasteful number, since it uses less digits than its factorization.

21317715006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528237 (or 528206 counting only the distinct ones).

The product of its (nonzero) digits is 8820, while the sum is 33.

The spelling of 21317715006 in words is "twenty-one billion, three hundred seventeen million, seven hundred fifteen thousand, six".