Adding to 11001111101011 its reverse (11010111110011), we get a palindrome (22011222211022).
It is a happy number.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is a Duffinian number.
Almost surely, 211001111101011 is an apocalyptic number.
11001111101011 is an equidigital number, since it uses as much as digits as its factorization.
11001111101011 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 123607989988.
The spelling of 11001111101011 in words is "eleven trillion, one billion, one hundred eleven million, one hundred one thousand, eleven".