11211211210211 has 4 divisors (see below), whose sum is σ = 11254834600392. Its totient is φ = 11167587820032.

The previous prime is 11211211210193. The next prime is 11211211210229. The reversal of 11211211210211 is 11201211211211.

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

It is an interprime number because it is at equal distance from previous prime (11211211210193) and next prime (11211211210229).

It is a cyclic number.

It is not a de Polignac number, because 11211211210211 - 2³⁴ = 11194031341027 is a prime.

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 11211211210211.

It is not an unprimeable number, because it can be changed into a prime (11211211213211) 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, 21811694705 + ... + 21811695218.

It is an arithmetic number, because the mean of its divisors is an integer number (2813708650098).

Almost surely, 2^{11211211210211} is an apocalyptic number.

11211211210211 is a deficient number, since it is larger than the sum of its proper divisors (43623390181).

11211211210211 is an equidigital number, since it uses as much as digits as its factorization.

11211211210211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43623390180.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 11211211210211 its reverse (11201211211211), we get a palindrome (22412422421422).

It can be divided in two parts, 1121121 and 1210211, that added together give a palindrome (2331332).

The spelling of 11211211210211 in words is "eleven trillion, two hundred eleven billion, two hundred eleven million, two hundred ten thousand, two hundred eleven".