21923768317 has 32 divisors (see below), whose sum is σ = 25479774720. Its totient is φ = 18654592320.

The previous prime is 21923768281. The next prime is 21923768329. The reversal of 21923768317 is 71386732912.

It is a cyclic number.

It is not a de Polignac number, because 21923768317 - 2¹¹ = 21923766269 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 (21923768357) 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 31 ways as a sum of consecutive naturals, for example, 9905703 + ... + 9907915.

It is an arithmetic number, because the mean of its divisors is an integer number (796242960).

Almost surely, 2^21923768317 is an apocalyptic number.

It is an amenable number.

21923768317 is a deficient number, since it is larger than the sum of its proper divisors (3556006403).

21923768317 is a wasteful number, since it uses less digits than its factorization.

21923768317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2793.

The product of its digits is 762048, while the sum is 49.

The spelling of 21923768317 in words is "twenty-one billion, nine hundred twenty-three million, seven hundred sixty-eight thousand, three hundred seventeen".