12321301221 has 6 divisors (see below), whose sum is σ = 17797435110. Its totient is φ = 8214200808.

The previous prime is 12321301219. The next prime is 12321301247. The reversal of 12321301221 is 12210312321.

12321301221 is a `hidden beast` number, since 123 + 21 + 301 + 221 = 666.

12321301221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 7865738721 + 4455562500 = 88689^2 + 66750^2 .

It is not a de Polignac number, because 12321301221 - 2¹ = 12321301219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12321301194 and 12321301203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12321301211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 684516726 + ... + 684516743.

It is an arithmetic number, because the mean of its divisors is an integer number (2966239185).

Almost surely, 2^12321301221 is an apocalyptic number.

It is an amenable number.

12321301221 is a deficient number, since it is larger than the sum of its proper divisors (5476133889).

12321301221 is a wasteful number, since it uses less digits than its factorization.

12321301221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1369033475 (or 1369033472 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 12321301221 its reverse (12210312321), we get a palindrome (24531613542).

The spelling of 12321301221 in words is "twelve billion, three hundred twenty-one million, three hundred one thousand, two hundred twenty-one".