12406021 has 2 divisors, whose sum is σ = 12406022. Its totient is φ = 12406020.

The previous prime is 12406013. The next prime is 12406027. The reversal of 12406021 is 12060421.

12406021 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., 6305121 + 6100900 = 2511^2 + 2470^2 .

It is a cyclic number.

It is not a de Polignac number, because 12406021 - 2³ = 12406013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12405986 and 12406004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12406027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6203010 + 6203011.

It is an arithmetic number, because the mean of its divisors is an integer number (6203011).

Almost surely, 2^12406021 is an apocalyptic number.

It is an amenable number.

12406021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12406021 is an equidigital number, since it uses as much as digits as its factorization.

12406021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 12406021 is about 3522.2181931277. The cubic root of 12406021 is about 231.4963621345.

Adding to 12406021 its reverse (12060421), we get a palindrome (24466442).

The spelling of 12406021 in words is "twelve million, four hundred six thousand, twenty-one".