11211011111 has 4 divisors (see below), whose sum is σ = 11220409632. Its totient is φ = 11201612592.

The previous prime is 11211011093. The next prime is 11211011159. The reversal of 11211011111 is 11111011211.

It is a happy number.

11211011111 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, and also an emirpimes, since its reverse is a distinct semiprime: 11111011211 = 76871 ⋅144541.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11211011111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11211011092 and 11211011101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211041111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4697471 + ... + 4699856.

It is an arithmetic number, because the mean of its divisors is an integer number (2805102408).

Almost surely, 2^11211011111 is an apocalyptic number.

11211011111 is a deficient number, since it is larger than the sum of its proper divisors (9398521).

11211011111 is an equidigital number, since it uses as much as digits as its factorization.

11211011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9398520.

The product of its (nonzero) digits is 2, while the sum is 11.

Adding to 11211011111 its reverse (11111011211), we get a palindrome (22322022322).

The spelling of 11211011111 in words is "eleven billion, two hundred eleven million, eleven thousand, one hundred eleven".