12127919449 has 2 divisors, whose sum is σ = 12127919450. Its totient is φ = 12127919448.

The previous prime is 12127919429. The next prime is 12127919467. The reversal of 12127919449 is 94491972121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9571100224 + 2556819225 = 97832^2 + 50565^2 .

It is a cyclic number.

It is not a de Polignac number, because 12127919449 - 2¹⁷ = 12127788377 is a prime.

It is a super-2 number, since 2×12127919449² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12127919429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6063959724 + 6063959725.

It is an arithmetic number, because the mean of its divisors is an integer number (6063959725).

Almost surely, 2^12127919449 is an apocalyptic number.

It is an amenable number.

12127919449 is a deficient number, since it is larger than the sum of its proper divisors (1).

12127919449 is an equidigital number, since it uses as much as digits as its factorization.

12127919449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 49.

The spelling of 12127919449 in words is "twelve billion, one hundred twenty-seven million, nine hundred nineteen thousand, four hundred forty-nine".