23821516317 has 4 divisors (see below), whose sum is σ = 31762021760. Its totient is φ = 15881010876.

The previous prime is 23821516309. The next prime is 23821516333. The reversal of 23821516317 is 71361512832.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 23821516317 - 2³ = 23821516309 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 (23821516517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3970252717 + ... + 3970252722.

It is an arithmetic number, because the mean of its divisors is an integer number (7940505440).

Almost surely, 2^23821516317 is an apocalyptic number.

It is an amenable number.

23821516317 is a deficient number, since it is larger than the sum of its proper divisors (7940505443).

23821516317 is an equidigital number, since it uses as much as digits as its factorization.

23821516317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7940505442.

The product of its digits is 60480, while the sum is 39.

The spelling of 23821516317 in words is "twenty-three billion, eight hundred twenty-one million, five hundred sixteen thousand, three hundred seventeen".