12307823821 has 4 divisors (see below), whose sum is σ = 12491522752. Its totient is φ = 12124124892.

The previous prime is 12307823813. The next prime is 12307823849. The reversal of 12307823821 is 12832870321.

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 a cyclic number.

It is not a de Polignac number, because 12307823821 - 2³ = 12307823813 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 (12307823321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91849365 + ... + 91849498.

It is an arithmetic number, because the mean of its divisors is an integer number (3122880688).

Almost surely, 2^12307823821 is an apocalyptic number.

It is an amenable number.

12307823821 is a deficient number, since it is larger than the sum of its proper divisors (183698931).

12307823821 is an equidigital number, since it uses as much as digits as its factorization.

12307823821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183698930.

The product of its (nonzero) digits is 32256, while the sum is 37.

The spelling of 12307823821 in words is "twelve billion, three hundred seven million, eight hundred twenty-three thousand, eight hundred twenty-one".