12318031821 has 8 divisors (see below), whose sum is σ = 16425121824. Its totient is φ = 8211481520.

The previous prime is 12318031799. The next prime is 12318031871. The reversal of 12318031821 is 12813081321.

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 12318031821 - 2¹³ = 12318023629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12318031871) 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, 78270 + ... + 175391.

It is an arithmetic number, because the mean of its divisors is an integer number (2053140228).

Almost surely, 2^12318031821 is an apocalyptic number.

It is an amenable number.

12318031821 is a deficient number, since it is larger than the sum of its proper divisors (4107090003).

12318031821 is a wasteful number, since it uses less digits than its factorization.

12318031821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269851.

The product of its (nonzero) digits is 2304, while the sum is 30.

The spelling of 12318031821 in words is "twelve billion, three hundred eighteen million, thirty-one thousand, eight hundred twenty-one".