12002021021 has 2 divisors, whose sum is σ = 12002021022. Its totient is φ = 12002021020.

The previous prime is 12002020999. The next prime is 12002021077. The reversal of 12002021021 is 12012020021.

It is a happy number.

12002021021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6945388921 + 5056632100 = 83339^2 + 71110^2 .

It is a cyclic number.

It is not a de Polignac number, because 12002021021 - 2¹⁸ = 12001758877 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12002020993 and 12002021011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12002021321) 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 as a sum of consecutive naturals, namely, 6001010510 + 6001010511.

It is an arithmetic number, because the mean of its divisors is an integer number (6001010511).

Almost surely, 2^12002021021 is an apocalyptic number.

It is an amenable number.

12002021021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12002021021 is an equidigital number, since it uses as much as digits as its factorization.

12002021021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 12002021021 its reverse (12012020021), we get a palindrome (24014041042).

The spelling of 12002021021 in words is "twelve billion, two million, twenty-one thousand, twenty-one".