12110021509 has 2 divisors, whose sum is σ = 12110021510. Its totient is φ = 12110021508.

The previous prime is 12110021489. The next prime is 12110021527. The reversal of 12110021509 is 90512001121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12095160484 + 14861025 = 109978^2 + 3855^2 .

It is a cyclic number.

It is not a de Polignac number, because 12110021509 - 2²³ = 12101632901 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12110021509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12110021309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6055010754 + 6055010755.

It is an arithmetic number, because the mean of its divisors is an integer number (6055010755).

Almost surely, 2^12110021509 is an apocalyptic number.

It is an amenable number.

12110021509 is a deficient number, since it is larger than the sum of its proper divisors (1).

12110021509 is an equidigital number, since it uses as much as digits as its factorization.

12110021509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 22.

The spelling of 12110021509 in words is "twelve billion, one hundred ten million, twenty-one thousand, five hundred nine".