12001221021 has 8 divisors (see below), whose sum is σ = 16024200160. Its totient is φ = 7989527952.

The previous prime is 12001221019. The next prime is 12001221031. The reversal of 12001221021 is 12012210021.

12001221021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12001221021 - 2¹ = 12001221019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12001220988 and 12001221006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001221031) 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 7 ways as a sum of consecutive naturals, for example, 2819035 + ... + 2823288.

It is an arithmetic number, because the mean of its divisors is an integer number (2003025020).

Almost surely, 2^12001221021 is an apocalyptic number.

It is an amenable number.

12001221021 is a deficient number, since it is larger than the sum of its proper divisors (4022979139).

12001221021 is an equidigital number, since it uses as much as digits as its factorization.

12001221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5643035.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 12001221021 its reverse (12012210021), we get a palindrome (24013431042).

It can be divided in two parts, 120012 and 21021, that multiplied together give a palindrome (2522772252).

The spelling of 12001221021 in words is "twelve billion, one million, two hundred twenty-one thousand, twenty-one".