11121112211 has 4 divisors (see below), whose sum is σ = 12132122424. Its totient is φ = 10110102000.

The previous prime is 11121112157. The next prime is 11121112253. The reversal of 11121112211 is 11221112111.

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 11121112211 - 2²² = 11116917907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11121112291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 505505090 + ... + 505505111.

It is an arithmetic number, because the mean of its divisors is an integer number (3033030606).

Almost surely, 2^11121112211 is an apocalyptic number.

11121112211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11121112211 is a deficient number, since it is larger than the sum of its proper divisors (1011010213).

11121112211 is a wasteful number, since it uses less digits than its factorization.

11121112211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011010212.

The product of its digits is 8, while the sum is 14.

Adding to 11121112211 its reverse (11221112111), we get a palindrome (22342224322).

The spelling of 11121112211 in words is "eleven billion, one hundred twenty-one million, one hundred twelve thousand, two hundred eleven".