12442021 has 2 divisors, whose sum is σ = 12442022. Its totient is φ = 12442020.

The previous prime is 12442019. The next prime is 12442033. The reversal of 12442021 is 12024421.

12442021 is digitally balanced in base 3, 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., 9060100 + 3381921 = 3010^2 + 1839^2 .

It is a cyclic number.

It is not a de Polignac number, because 12442021 - 2¹ = 12442019 is a prime.

Together with 12442019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 12441986 and 12442004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12442051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6221010 + 6221011.

It is an arithmetic number, because the mean of its divisors is an integer number (6221011).

Almost surely, 2^12442021 is an apocalyptic number.

It is an amenable number.

12442021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12442021 is an equidigital number, since it uses as much as digits as its factorization.

12442021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 12442021 is about 3527.3249070648. The cubic root of 12442021 is about 231.7200659013.

Adding to 12442021 its reverse (12024421), we get a palindrome (24466442).

The spelling of 12442021 in words is "twelve million, four hundred forty-two thousand, twenty-one".