12111213281 has 2 divisors, whose sum is σ = 12111213282. Its totient is φ = 12111213280.

The previous prime is 12111213271. The next prime is 12111213319. The reversal of 12111213281 is 18231211121.

It is a happy number.

12111213281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11768778256 + 342435025 = 108484^2 + 18505^2 .

It is a cyclic number.

It is not a de Polignac number, because 12111213281 - 2⁶ = 12111213217 is a prime.

It is a super-2 number, since 2×12111213281² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12111213251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6055606640 + 6055606641.

It is an arithmetic number, because the mean of its divisors is an integer number (6055606641).

Almost surely, 2^12111213281 is an apocalyptic number.

It is an amenable number.

12111213281 is a deficient number, since it is larger than the sum of its proper divisors (1).

12111213281 is an equidigital number, since it uses as much as digits as its factorization.

12111213281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192, while the sum is 23.

The spelling of 12111213281 in words is "twelve billion, one hundred eleven million, two hundred thirteen thousand, two hundred eighty-one".