11221211201111 has 16 divisors (see below), whose sum is σ = 11379018276288. Its totient is φ = 11064517728000.

The previous prime is 11221211201099. The next prime is 11221211201113. The reversal of 11221211201111 is 11110211212211.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11221211201111 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 11221211201111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221211201113) 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 15 ways as a sum of consecutive naturals, for example, 332237021 + ... + 332270793.

It is an arithmetic number, because the mean of its divisors is an integer number (711188642268).

Almost surely, 2^{11221211201111} is an apocalyptic number.

11221211201111 is a deficient number, since it is larger than the sum of its proper divisors (157807075177).

11221211201111 is a wasteful number, since it uses less digits than its factorization.

11221211201111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50122.

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

Adding to 11221211201111 its reverse (11110211212211), we get a palindrome (22331422413322).

It can be divided in two parts, 1122121 and 1201111, that added together give a palindrome (2323232).

The spelling of 11221211201111 in words is "eleven trillion, two hundred twenty-one billion, two hundred eleven million, two hundred one thousand, one hundred eleven".