12421211021 has 2 divisors, whose sum is σ = 12421211022. Its totient is φ = 12421211020.

The previous prime is 12421210969. The next prime is 12421211029. The reversal of 12421211021 is 12011212421.

12421211021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6758648521 + 5662562500 = 82211^2 + 75250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12421211021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12421211029) 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, 6210605510 + 6210605511.

It is an arithmetic number, because the mean of its divisors is an integer number (6210605511).

Almost surely, 2^12421211021 is an apocalyptic number.

It is an amenable number.

12421211021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12421211021 is an equidigital number, since it uses as much as digits as its factorization.

12421211021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 12421211021 its reverse (12011212421), we get a palindrome (24432423442).

The spelling of 12421211021 in words is "twelve billion, four hundred twenty-one million, two hundred eleven thousand, twenty-one".