12127708181 has 2 divisors, whose sum is σ = 12127708182. Its totient is φ = 12127708180.

The previous prime is 12127708127. The next prime is 12127708213. The reversal of 12127708181 is 18180772121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11752511281 + 375196900 = 108409^2 + 19370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12127708181 is a prime.

It is a super-2 number, since 2×12127708181² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12127708381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6063854090 + 6063854091.

It is an arithmetic number, because the mean of its divisors is an integer number (6063854091).

Almost surely, 2^12127708181 is an apocalyptic number.

It is an amenable number.

12127708181 is a deficient number, since it is larger than the sum of its proper divisors (1).

12127708181 is an equidigital number, since it uses as much as digits as its factorization.

12127708181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12544, while the sum is 38.

The spelling of 12127708181 in words is "twelve billion, one hundred twenty-seven million, seven hundred eight thousand, one hundred eighty-one".