12001023221 has 16 divisors (see below), whose sum is σ = 13157641728. Its totient is φ = 10855446000.

The previous prime is 12001023127. The next prime is 12001023239. The reversal of 12001023221 is 12232010021.

It is a happy number.

12001023221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 12001023221 - 2¹⁸ = 12000761077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12001023196 and 12001023205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001023241) 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 15 ways as a sum of consecutive naturals, for example, 3038570 + ... + 3042516.

It is an arithmetic number, because the mean of its divisors is an integer number (822352608).

Almost surely, 2^12001023221 is an apocalyptic number.

12001023221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12001023221 is a deficient number, since it is larger than the sum of its proper divisors (1156618507).

12001023221 is a wasteful number, since it uses less digits than its factorization.

12001023221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5272.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 12001023221 its reverse (12232010021), we get a palindrome (24233033242).

The spelling of 12001023221 in words is "twelve billion, one million, twenty-three thousand, two hundred twenty-one".