11121101111 has 2 divisors, whose sum is σ = 11121101112. Its totient is φ = 11121101110.

The previous prime is 11121101087. The next prime is 11121101149. The reversal of 11121101111 is 11110112111.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11121101111 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 11121101092 and 11121101101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11121101171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5560550555 + 5560550556.

It is an arithmetic number, because the mean of its divisors is an integer number (5560550556).

Almost surely, 2^11121101111 is an apocalyptic number.

11121101111 is a deficient number, since it is larger than the sum of its proper divisors (1).

11121101111 is an equidigital number, since it uses as much as digits as its factorization.

11121101111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2, while the sum is 11.

Adding to 11121101111 its reverse (11110112111), we get a palindrome (22231213222).

The spelling of 11121101111 in words is "eleven billion, one hundred twenty-one million, one hundred one thousand, one hundred eleven".