11121229081 has 2 divisors, whose sum is σ = 11121229082. Its totient is φ = 11121229080.

The previous prime is 11121229039. The next prime is 11121229087. The reversal of 11121229081 is 18092212111.

11121229081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6020984025 + 5100245056 = 77595^2 + 71416^2 .

It is an emirp because it is prime and its reverse (18092212111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11121229081 - 2⁷ = 11121228953 is a prime.

It is a super-2 number, since 2×11121229081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11121229087) 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, 5560614540 + 5560614541.

It is an arithmetic number, because the mean of its divisors is an integer number (5560614541).

Almost surely, 2^11121229081 is an apocalyptic number.

It is an amenable number.

11121229081 is a deficient number, since it is larger than the sum of its proper divisors (1).

11121229081 is an equidigital number, since it uses as much as digits as its factorization.

11121229081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 28.

The spelling of 11121229081 in words is "eleven billion, one hundred twenty-one million, two hundred twenty-nine thousand, eighty-one".