20110211111 has 4 divisors (see below), whose sum is σ = 20110602792.
Its totient is φ = 20109819432.
The previous prime is 20110211089. The next prime is 20110211123. The reversal of 20110211111 is 11111201102.
Adding to 20110211111 its reverse (11111201102), we get a palindrome (31221412213).
It can be divided in two parts, 201102 and 11111, that multiplied together give a palindrome (2234444322).
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 20110211111 - 218 = 20109948967 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 20110211092 and 20110211101.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (20110211141) 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, 104681 + ... + 226226.
It is an arithmetic number, because the mean of its divisors is an integer number (5027650698).
Almost surely, 220110211111 is an apocalyptic number.
20110211111 is a deficient number, since it is larger than the sum of its proper divisors (391681).
20110211111 is an equidigital number, since it uses as much as digits as its factorization.
20110211111 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 391680.
The product of its (nonzero) digits is 4, while the sum is 11.
The spelling of 20110211111 in words is "twenty billion, one hundred ten million, two hundred eleven thousand, one hundred eleven".