12015404021 has 2 divisors, whose sum is σ = 12015404022. Its totient is φ = 12015404020.

The previous prime is 12015403991. The next prime is 12015404029. The reversal of 12015404021 is 12040451021.

It is a happy number.

12015404021 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., 7197655921 + 4817748100 = 84839^2 + 69410^2 .

It is a cyclic number.

It is not a de Polignac number, because 12015404021 - 2²⁶ = 11948295157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12015403984 and 12015404002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12015404029) 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, 6007702010 + 6007702011.

It is an arithmetic number, because the mean of its divisors is an integer number (6007702011).

Almost surely, 2^12015404021 is an apocalyptic number.

It is an amenable number.

12015404021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12015404021 is an equidigital number, since it uses as much as digits as its factorization.

12015404021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 12015404021 its reverse (12040451021), we get a palindrome (24055855042).

The spelling of 12015404021 in words is "twelve billion, fifteen million, four hundred four thousand, twenty-one".