12321851 has 4 divisors (see below), whose sum is σ = 12654912. Its totient is φ = 11988792.

The previous prime is 12321847. The next prime is 12321863. The reversal of 12321851 is 15812321.

It is a happy number.

12321851 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15812321 = 7 ⋅2258903.

It is a cyclic number.

It is not a de Polignac number, because 12321851 - 2² = 12321847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12321151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166475 + ... + 166548.

It is an arithmetic number, because the mean of its divisors is an integer number (3163728).

Almost surely, 2^12321851 is an apocalyptic number.

12321851 is a deficient number, since it is larger than the sum of its proper divisors (333061).

12321851 is an equidigital number, since it uses as much as digits as its factorization.

12321851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333060.

The product of its digits is 480, while the sum is 23.

The square root of 12321851 is about 3510.2494213375. The cubic root of 12321851 is about 230.9716362293.

The spelling of 12321851 in words is "twelve million, three hundred twenty-one thousand, eight hundred fifty-one".