12126913889 has 2 divisors, whose sum is σ = 12126913890. Its totient is φ = 12126913888.

The previous prime is 12126913871. The next prime is 12126913937. The reversal of 12126913889 is 98831962121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10571952400 + 1554961489 = 102820^2 + 39433^2 .

It is a cyclic number.

It is not a de Polignac number, because 12126913889 - 2¹⁶ = 12126848353 is a prime.

It is a super-2 number, since 2×12126913889² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (12126913849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6063456944 + 6063456945.

It is an arithmetic number, because the mean of its divisors is an integer number (6063456945).

Almost surely, 2^12126913889 is an apocalyptic number.

It is an amenable number.

12126913889 is a deficient number, since it is larger than the sum of its proper divisors (1).

12126913889 is an equidigital number, since it uses as much as digits as its factorization.

12126913889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 50.

The spelling of 12126913889 in words is "twelve billion, one hundred twenty-six million, nine hundred thirteen thousand, eight hundred eighty-nine".