12126444521 has 2 divisors, whose sum is σ = 12126444522. Its totient is φ = 12126444520.

The previous prime is 12126444497. The next prime is 12126444529. The reversal of 12126444521 is 12544462121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9281395600 + 2845048921 = 96340^2 + 53339^2 .

It is a cyclic number.

It is not a de Polignac number, because 12126444521 - 2³⁰ = 11052702697 is a prime.

It is not a weakly prime, because it can be changed into another prime (12126444529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6063222260 + 6063222261.

It is an arithmetic number, because the mean of its divisors is an integer number (6063222261).

Almost surely, 2^12126444521 is an apocalyptic number.

It is an amenable number.

12126444521 is a deficient number, since it is larger than the sum of its proper divisors (1).

12126444521 is an equidigital number, since it uses as much as digits as its factorization.

12126444521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15360, while the sum is 32.

The spelling of 12126444521 in words is "twelve billion, one hundred twenty-six million, four hundred forty-four thousand, five hundred twenty-one".