11001111110021 has 2 divisors, whose sum is σ = 11001111110022. Its totient is φ = 11001111110020.

The previous prime is 11001111109999. The next prime is 11001111110039. The reversal of 11001111110021 is 12001111110011.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5899001433796 + 5102109676225 = 2428786^2 + 2258785^2 .

It is a cyclic number.

It is not a de Polignac number, because 11001111110021 - 2³⁰ = 11000037368197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11001111109984 and 11001111110011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11001111110071) 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, 5500555555010 + 5500555555011.

It is an arithmetic number, because the mean of its divisors is an integer number (5500555555011).

Almost surely, 2^{11001111110021} is an apocalyptic number.

It is an amenable number.

11001111110021 is a deficient number, since it is larger than the sum of its proper divisors (1).

11001111110021 is an equidigital number, since it uses as much as digits as its factorization.

11001111110021 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 11001111110021 its reverse (12001111110011), we get a palindrome (23002222220032).

The spelling of 11001111110021 in words is "eleven trillion, one billion, one hundred eleven million, one hundred ten thousand, twenty-one".