11211111211 has 4 divisors (see below), whose sum is σ = 11215512000. Its totient is φ = 11206710424.

The previous prime is 11211111209. The next prime is 11211111271.

11211111211 is nontrivially palindromic in base 10.

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 11211111211 - 2¹ = 11211111209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11211111191 and 11211111200.

It is not an unprimeable number, because it can be changed into a prime (11211111271) 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, 2196571 + ... + 2201668.

It is an arithmetic number, because the mean of its divisors is an integer number (2803878000).

Almost surely, 2^11211111211 is an apocalyptic number.

11211111211 is a deficient number, since it is larger than the sum of its proper divisors (4400789).

11211111211 is an equidigital number, since it uses as much as digits as its factorization.

11211111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4400788.

The product of its digits is 4, while the sum is 13.

The spelling of 11211111211 in words is "eleven billion, two hundred eleven million, one hundred eleven thousand, two hundred eleven".