11121111122211 has 48 divisors (see below), whose sum is σ = 16492178252160. Its totient is φ = 7219534233600.

The previous prime is 11121111122141. The next prime is 11121111122237. The reversal of 11121111122211 is 11222111112111.

11121111122211 is a `hidden beast` number, since 111 + 211 + 11 + 122 + 211 = 666.

It is not a de Polignac number, because 11121111122211 - 2⁷ = 11121111122083 is a prime.

It is a super-2 number, since 2×11121111122211² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11121111122291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18154131 + ... + 18756723.

It is an arithmetic number, because the mean of its divisors is an integer number (343587046920).

Almost surely, 2^{11121111122211} is an apocalyptic number.

11121111122211 is a deficient number, since it is larger than the sum of its proper divisors (5371067129949).

11121111122211 is a wasteful number, since it uses less digits than its factorization.

11121111122211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603036 (or 603033 counting only the distinct ones).

The product of its digits is 16, while the sum is 18.

Adding to 11121111122211 its reverse (11222111112111), we get a palindrome (22343222234322).

It can be divided in two parts, 1112111 and 1122211, that added together give a palindrome (2234322).

The spelling of 11121111122211 in words is "eleven trillion, one hundred twenty-one billion, one hundred eleven million, one hundred twenty-two thousand, two hundred eleven".