21313763717 has 8 divisors (see below), whose sum is σ = 22288084416. Its totient is φ = 20343412672.

The previous prime is 21313763711. The next prime is 21313763771. The reversal of 21313763717 is 71736731312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21313763717 - 2²⁰ = 21312715141 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 (21313763711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 981428 + ... + 1002909.

It is an arithmetic number, because the mean of its divisors is an integer number (2786010552).

Almost surely, 2^21313763717 is an apocalyptic number.

It is an amenable number.

21313763717 is a deficient number, since it is larger than the sum of its proper divisors (974320699).

21313763717 is a wasteful number, since it uses less digits than its factorization.

21313763717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1984827.

The product of its digits is 111132, while the sum is 41.

The spelling of 21313763717 in words is "twenty-one billion, three hundred thirteen million, seven hundred sixty-three thousand, seven hundred seventeen".