11100111721 has 2 divisors, whose sum is σ = 11100111722. Its totient is φ = 11100111720.

The previous prime is 11100111713. The next prime is 11100111727. The reversal of 11100111721 is 12711100111.

11100111721 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., 7163929600 + 3936182121 = 84640^2 + 62739^2 .

It is a cyclic number.

It is not a de Polignac number, because 11100111721 - 2³ = 11100111713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11100111695 and 11100111704.

It is not a weakly prime, because it can be changed into another prime (11100111727) 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, 5550055860 + 5550055861.

It is an arithmetic number, because the mean of its divisors is an integer number (5550055861).

Almost surely, 2^11100111721 is an apocalyptic number.

It is an amenable number.

11100111721 is a deficient number, since it is larger than the sum of its proper divisors (1).

11100111721 is an equidigital number, since it uses as much as digits as its factorization.

11100111721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14, while the sum is 16.

Adding to 11100111721 its reverse (12711100111), we get a palindrome (23811211832).

The spelling of 11100111721 in words is "eleven billion, one hundred million, one hundred eleven thousand, seven hundred twenty-one".