11011111110121 has 4 divisors (see below), whose sum is σ = 11012204685700. Its totient is φ = 11010017534544.

The previous prime is 11011111110113. The next prime is 11011111110143. The reversal of 11011111110121 is 12101111111011.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 972758101225 + 10038353008896 = 986285^2 + 3168336^2 .

It is a cyclic number.

It is not a de Polignac number, because 11011111110121 - 2³ = 11011111110113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11011111110221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 546772686 + ... + 546792823.

It is an arithmetic number, because the mean of its divisors is an integer number (2753051171425).

Almost surely, 2^{11011111110121} is an apocalyptic number.

It is an amenable number.

11011111110121 is a deficient number, since it is larger than the sum of its proper divisors (1093575579).

11011111110121 is a wasteful number, since it uses less digits than its factorization.

11011111110121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1093575578.

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

Adding to 11011111110121 its reverse (12101111111011), we get a palindrome (23112222221132).

The spelling of 11011111110121 in words is "eleven trillion, eleven billion, one hundred eleven million, one hundred ten thousand, one hundred twenty-one".