12021323321 has 6 divisors (see below), whose sum is σ = 13983988410. Its totient is φ = 10303991376.

The previous prime is 12021323317. The next prime is 12021323341. The reversal of 12021323321 is 12332312021.

12021323321 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., 11932285225 + 89038096 = 109235^2 + 9436^2 .

It is not a de Polignac number, because 12021323321 - 2² = 12021323317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12021323293 and 12021323302.

It is not an unprimeable number, because it can be changed into a prime (12021323311) 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, 122666516 + ... + 122666613.

It is an arithmetic number, because the mean of its divisors is an integer number (2330664735).

Almost surely, 2^12021323321 is an apocalyptic number.

It is an amenable number.

12021323321 is a deficient number, since it is larger than the sum of its proper divisors (1962665089).

12021323321 is an equidigital number, since it uses as much as digits as its factorization.

12021323321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245333143 (or 245333136 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 12021323321 its reverse (12332312021), we get a palindrome (24353635342).

The spelling of 12021323321 in words is "twelve billion, twenty-one million, three hundred twenty-three thousand, three hundred twenty-one".