11221212211 has 18 divisors (see below), whose sum is σ = 12458758508. Its totient is φ = 10098990000.

The previous prime is 11221212203. The next prime is 11221212227.

11221212211 is nontrivially palindromic in base 10.

11221212211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11221212211 - 2³ = 11221212203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11221212241) 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 17 ways as a sum of consecutive naturals, for example, 1229776 + ... + 1238866.

Almost surely, 2^11221212211 is an apocalyptic number.

11221212211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11221212211 is a deficient number, since it is larger than the sum of its proper divisors (1237546297).

11221212211 is an equidigital number, since it uses as much as digits as its factorization.

11221212211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9315 (or 9203 counting only the distinct ones).

The product of its digits is 32, while the sum is 16.

The spelling of 11221212211 in words is "eleven billion, two hundred twenty-one million, two hundred twelve thousand, two hundred eleven".