11100111111121 has 2 divisors, whose sum is σ = 11100111111122. Its totient is φ = 11100111111120.

The previous prime is 11100111111097. The next prime is 11100111111139. The reversal of 11100111111121 is 12111111100111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8122277701521 + 2977833409600 = 2849961^2 + 1725640^2 .

It is a cyclic number.

It is not a de Polignac number, because 11100111111121 - 2⁴³ = 2304018088913 is a prime.

It is not a weakly prime, because it can be changed into another prime (11100111111181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5550055555560 + 5550055555561.

It is an arithmetic number, because the mean of its divisors is an integer number (5550055555561).

Almost surely, 2^{11100111111121} is an apocalyptic number.

It is an amenable number.

11100111111121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11100111111121 is an equidigital number, since it uses as much as digits as its factorization.

11100111111121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2, while the sum is 13.

Adding to 11100111111121 its reverse (12111111100111), we get a palindrome (23211222211232).

The spelling of 11100111111121 in words is "eleven trillion, one hundred billion, one hundred eleven million, one hundred eleven thousand, one hundred twenty-one".