11212222211 has 4 divisors (see below), whose sum is σ = 11871764712. Its totient is φ = 10552679712.

The previous prime is 11212222207. The next prime is 11212222243. The reversal of 11212222211 is 11222221211.

11212222211 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.

It is a cyclic number.

It is not a de Polignac number, because 11212222211 - 2² = 11212222207 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 659542483 = 11212222211 / (1 + 1 + 2 + 1 + 2 + 2 + 2 + 2 + 2 + 1 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11212222211.

It is not an unprimeable number, because it can be changed into a prime (11212222261) 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, 329771225 + ... + 329771258.

It is an arithmetic number, because the mean of its divisors is an integer number (2967941178).

Almost surely, 2^11212222211 is an apocalyptic number.

11212222211 is a deficient number, since it is larger than the sum of its proper divisors (659542501).

11212222211 is an equidigital number, since it uses as much as digits as its factorization.

11212222211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659542500.

The product of its digits is 64, while the sum is 17.

Adding to 11212222211 its reverse (11222221211), we get a palindrome (22434443422).

The spelling of 11212222211 in words is "eleven billion, two hundred twelve million, two hundred twenty-two thousand, two hundred eleven".