12015312266521 has 2 divisors, whose sum is σ = 12015312266522. Its totient is φ = 12015312266520.

The previous prime is 12015312266513. The next prime is 12015312266651. The reversal of 12015312266521 is 12566221351021.

12015312266521 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., 8817781775625 + 3197530490896 = 2969475^2 + 1788164^2 .

It is a cyclic number.

It is not a de Polignac number, because 12015312266521 - 2³ = 12015312266513 is a prime.

It is not a weakly prime, because it can be changed into another prime (12015312216521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6007656133260 + 6007656133261.

It is an arithmetic number, because the mean of its divisors is an integer number (6007656133261).

Almost surely, 2^{12015312266521} is an apocalyptic number.

It is an amenable number.

12015312266521 is a deficient number, since it is larger than the sum of its proper divisors (1).

12015312266521 is an equidigital number, since it uses as much as digits as its factorization.

12015312266521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 37.

The spelling of 12015312266521 in words is "twelve trillion, fifteen billion, three hundred twelve million, two hundred sixty-six thousand, five hundred twenty-one".