11212211 has 4 divisors (see below), whose sum is σ = 11261832. Its totient is φ = 11162592.

The previous prime is 11212171. The next prime is 11212219. The reversal of 11212211 is 11221211.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11212211 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11212192 and 11212201.

It is not an unprimeable number, because it can be changed into a prime (11212219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24470 + ... + 24923.

It is an arithmetic number, because the mean of its divisors is an integer number (2815458).

Almost surely, 2^11212211 is an apocalyptic number.

11212211 is a deficient number, since it is larger than the sum of its proper divisors (49621).

11212211 is an equidigital number, since it uses as much as digits as its factorization.

11212211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49620.

The product of its digits is 8, while the sum is 11.

The square root of 11212211 is about 3348.4639762136. The cubic root of 11212211 is about 223.8190702568.

Adding to 11212211 its reverse (11221211), we get a palindrome (22433422).

The spelling of 11212211 in words is "eleven million, two hundred twelve thousand, two hundred eleven".