11111001011011 has 4 divisors (see below), whose sum is σ = 12121092012024. Its totient is φ = 10100910010000.

The previous prime is 11111001011009. The next prime is 11111001011027. The reversal of 11111001011011 is 11011010011111.

It is a happy number.

11111001011011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 11111001011011 - 2¹ = 11111001011009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11111001011111) 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, 505045500490 + ... + 505045500511.

It is an arithmetic number, because the mean of its divisors is an integer number (3030273003006).

Almost surely, 2^{11111001011011} is an apocalyptic number.

11111001011011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11111001011011 is a deficient number, since it is larger than the sum of its proper divisors (1010091001013).

11111001011011 is a wasteful number, since it uses less digits than its factorization.

11111001011011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010091001012.

The product of its (nonzero) digits is 1, while the sum is 10.

Adding to 11111001011011 its reverse (11011010011111), we get a palindrome (22122011022122).

The spelling of 11111001011011 in words is "eleven trillion, one hundred eleven billion, one million, eleven thousand, eleven".