12021123321 has 6 divisors (see below), whose sum is σ = 17363844810. Its totient is φ = 8014082208.

The previous prime is 12021123311. The next prime is 12021123337. The reversal of 12021123321 is 12332112021.

12021123321 is a `hidden beast` number, since 120 + 211 + 2 + 332 + 1 = 666.

12021123321 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., 9331560000 + 2689563321 = 96600^2 + 51861^2 .

It is not a de Polignac number, because 12021123321 - 2²¹ = 12019026169 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12021123294 and 12021123303.

It is not an unprimeable number, because it can be changed into a prime (12021123311) 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, 667840176 + ... + 667840193.

It is an arithmetic number, because the mean of its divisors is an integer number (2893974135).

Almost surely, 2^12021123321 is an apocalyptic number.

It is an amenable number.

12021123321 is a deficient number, since it is larger than the sum of its proper divisors (5342721489).

12021123321 is a wasteful number, since it uses less digits than its factorization.

12021123321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1335680375 (or 1335680372 counting only the distinct ones).

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

Adding to 12021123321 its reverse (12332112021), we get a palindrome (24353235342).

The spelling of 12021123321 in words is "twelve billion, twenty-one million, one hundred twenty-three thousand, three hundred twenty-one".