11011212221211 has 24 divisors (see below), whose sum is σ = 16356416953344. Its totient is φ = 7133022207360.

The previous prime is 11011212221209. The next prime is 11011212221231. The reversal of 11011212221211 is 11212221211011.

It is a happy number.

11011212221211 is a `hidden beast` number, since 1 + 10 + 11 + 212 + 221 + 211 = 666.

It is not a de Polignac number, because 11011212221211 - 2¹ = 11011212221209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11011212221231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21472411 + ... + 21979236.

It is an arithmetic number, because the mean of its divisors is an integer number (681517373056).

Almost surely, 2^{11011212221211} is an apocalyptic number.

11011212221211 is a deficient number, since it is larger than the sum of its proper divisors (5345204732133).

11011212221211 is a wasteful number, since it uses less digits than its factorization.

11011212221211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43452451 (or 43452448 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 11011212221211 its reverse (11212221211011), we get a palindrome (22223433432222).

The spelling of 11011212221211 in words is "eleven trillion, eleven billion, two hundred twelve million, two hundred twenty-one thousand, two hundred eleven".