11011111001111 has 4 divisors (see below), whose sum is σ = 11858119539672. Its totient is φ = 10164102462552.

The previous prime is 11011111001089. The next prime is 11011111001129. The reversal of 11011111001111 is 11110011111011.

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

It is a cyclic number.

It is not a de Polignac number, because 11011111001111 - 2³⁴ = 10993931131927 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11011111001092 and 11011111001101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11011111001141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 423504269261 + ... + 423504269286.

It is an arithmetic number, because the mean of its divisors is an integer number (2964529884918).

Almost surely, 2^{11011111001111} is an apocalyptic number.

11011111001111 is a deficient number, since it is larger than the sum of its proper divisors (847008538561).

11011111001111 is an equidigital number, since it uses as much as digits as its factorization.

11011111001111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847008538560.

The product of its (nonzero) digits is 1, while the sum is 11.

Adding to 11011111001111 its reverse (11110011111011), we get a palindrome (22121122112122).

The spelling of 11011111001111 in words is "eleven trillion, eleven billion, one hundred eleven million, one thousand, one hundred eleven".