12489268021 has 2 divisors, whose sum is σ = 12489268022. Its totient is φ = 12489268020.

The previous prime is 12489268009. The next prime is 12489268063. The reversal of 12489268021 is 12086298421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8554215121 + 3935052900 = 92489^2 + 62730^2 .

It is a cyclic number.

It is not a de Polignac number, because 12489268021 - 2⁷ = 12489267893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12489268091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6244634010 + 6244634011.

It is an arithmetic number, because the mean of its divisors is an integer number (6244634011).

Almost surely, 2^12489268021 is an apocalyptic number.

It is an amenable number.

12489268021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12489268021 is an equidigital number, since it uses as much as digits as its factorization.

12489268021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 110592, while the sum is 43.

The spelling of 12489268021 in words is "twelve billion, four hundred eighty-nine million, two hundred sixty-eight thousand, twenty-one".