11111222212211 has 16 divisors (see below), whose sum is σ = 12322415229696. Its totient is φ = 9934867500000.

The previous prime is 11111222212151. The next prime is 11111222212219. The reversal of 11111222212211 is 11221222211111.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11111222212211 is a prime.

It is a super-2 number, since 2×11111222212211² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11111222212219) 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, 32948465 + ... + 33283986.

It is an arithmetic number, because the mean of its divisors is an integer number (770150951856).

Almost surely, 2^{11111222212211} is an apocalyptic number.

11111222212211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11111222212211 is a deficient number, since it is larger than the sum of its proper divisors (1211193017485).

11111222212211 is a wasteful number, since it uses less digits than its factorization.

11111222212211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66232714.

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

Adding to 11111222212211 its reverse (11221222211111), we get a palindrome (22332444423322).

The spelling of 11111222212211 in words is "eleven trillion, one hundred eleven billion, two hundred twenty-two million, two hundred twelve thousand, two hundred eleven".