21030217317 has 48 divisors (see below), whose sum is σ = 33083281920. Its totient is φ = 12824179200.

The previous prime is 21030217277. The next prime is 21030217331. The reversal of 21030217317 is 71371203012.

It is not a de Polignac number, because 21030217317 - 2¹² = 21030213221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030217717) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2418217 + ... + 2426897.

It is an arithmetic number, because the mean of its divisors is an integer number (689235040).

Almost surely, 2^21030217317 is an apocalyptic number.

It is an amenable number.

21030217317 is a deficient number, since it is larger than the sum of its proper divisors (12053064603).

21030217317 is a wasteful number, since it uses less digits than its factorization.

21030217317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9194 (or 9191 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The spelling of 21030217317 in words is "twenty-one billion, thirty million, two hundred seventeen thousand, three hundred seventeen".