12135126227891 has 2 divisors, whose sum is σ = 12135126227892. Its totient is φ = 12135126227890.

The previous prime is 12135126227831. The next prime is 12135126227927. The reversal of 12135126227891 is 19872262153121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12135126227891 - 2⁶ = 12135126227827 is a prime.

It is a super-2 number, since 2×12135126227891² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12135126227801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6067563113945 + 6067563113946.

It is an arithmetic number, because the mean of its divisors is an integer number (6067563113946).

Almost surely, 2^{12135126227891} is an apocalyptic number.

12135126227891 is a deficient number, since it is larger than the sum of its proper divisors (1).

12135126227891 is an equidigital number, since it uses as much as digits as its factorization.

12135126227891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 50.

The spelling of 12135126227891 in words is "twelve trillion, one hundred thirty-five billion, one hundred twenty-six million, two hundred twenty-seven thousand, eight hundred ninety-one".