11122212221111 has 4 divisors (see below), whose sum is σ = 11122911703224. Its totient is φ = 11121512739000.

The previous prime is 11122212220981. The next prime is 11122212221143. The reversal of 11122212221111 is 11112221222111.

It is a happy number.

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-11122212221111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11122212220111) 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, 349717205 + ... + 349749006.

It is an arithmetic number, because the mean of its divisors is an integer number (2780727925806).

Almost surely, 2^{11122212221111} is an apocalyptic number.

11122212221111 is a deficient number, since it is larger than the sum of its proper divisors (699482113).

11122212221111 is an equidigital number, since it uses as much as digits as its factorization.

11122212221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699482112.

The product of its digits is 64, while the sum is 20.

Adding to 11122212221111 its reverse (11112221222111), we get a palindrome (22234433443222).

It can be divided in two parts, 111 and 22212221111, that added together give a palindrome (22212221222).

The spelling of 11122212221111 in words is "eleven trillion, one hundred twenty-two billion, two hundred twelve million, two hundred twenty-one thousand, one hundred eleven".