11123110021 has 2 divisors, whose sum is σ = 11123110022. Its totient is φ = 11123110020.

The previous prime is 11123110007. The next prime is 11123110039. The reversal of 11123110021 is 12001132111.

It is a happy number.

11123110021 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., 5969880225 + 5153229796 = 77265^2 + 71786^2 .

It is an emirp because it is prime and its reverse (12001132111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11123110021 - 2¹⁷ = 11122978949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11123109983 and 11123110010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11123110001) 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, 5561555010 + 5561555011.

It is an arithmetic number, because the mean of its divisors is an integer number (5561555011).

Almost surely, 2^11123110021 is an apocalyptic number.

It is an amenable number.

11123110021 is a deficient number, since it is larger than the sum of its proper divisors (1).

11123110021 is an equidigital number, since it uses as much as digits as its factorization.

11123110021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 11123110021 its reverse (12001132111), we get a palindrome (23124242132).

The spelling of 11123110021 in words is "eleven billion, one hundred twenty-three million, one hundred ten thousand, twenty-one".