12321021 has 4 divisors (see below), whose sum is σ = 16428032. Its totient is φ = 8214012.

The previous prime is 12321017. The next prime is 12321041. The reversal of 12321021 is 12012321.

12321021 is digitally balanced in base 2, 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12321021 - 2² = 12321017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12320988 and 12321006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12321011) 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, 2053501 + ... + 2053506.

It is an arithmetic number, because the mean of its divisors is an integer number (4107008).

Almost surely, 2^12321021 is an apocalyptic number.

It is an amenable number.

12321021 is a deficient number, since it is larger than the sum of its proper divisors (4107011).

12321021 is an equidigital number, since it uses as much as digits as its factorization.

12321021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4107010.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 12321021 is about 3510.1311941294. The cubic root of 12321021 is about 230.9664500290.

Adding to 12321021 its reverse (12012321), we get a palindrome (24333342).

The spelling of 12321021 in words is "twelve million, three hundred twenty-one thousand, twenty-one".