12318821 has 8 divisors (see below), whose sum is σ = 13162080. Its totient is φ = 11495088.

The previous prime is 12318809. The next prime is 12318851. The reversal of 12318821 is 12881321.

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 12318821 - 2¹⁰ = 12317797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12318851) 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, 3566 + ... + 6111.

It is an arithmetic number, because the mean of its divisors is an integer number (1645260).

Almost surely, 2^12318821 is an apocalyptic number.

It is an amenable number.

12318821 is a deficient number, since it is larger than the sum of its proper divisors (843259).

12318821 is an equidigital number, since it uses as much as digits as its factorization.

12318821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9763.

The product of its digits is 768, while the sum is 26.

The square root of 12318821 is about 3509.8178015390. The cubic root of 12318821 is about 230.9527023470.

Subtracting 12318821 from its reverse (12881321), we obtain a square (562500 = 750²).

The spelling of 12318821 in words is "twelve million, three hundred eighteen thousand, eight hundred twenty-one".