11211222120111 has 80 divisors (see below), whose sum is σ = 18416444079264. Its totient is φ = 6755028120576.

The previous prime is 11211222120103. The next prime is 11211222120151. The reversal of 11211222120111 is 11102122211211.

It is a happy number.

11211222120111 is a `hidden beast` number, since 1 + 1 + 211 + 222 + 120 + 111 = 666.

It is not a de Polignac number, because 11211222120111 - 2³ = 11211222120103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211222120151) 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 79 ways as a sum of consecutive naturals, for example, 9998760 + ... + 11063346.

Almost surely, 2^{11211222120111} is an apocalyptic number.

11211222120111 is a deficient number, since it is larger than the sum of its proper divisors (7205221959153).

11211222120111 is a wasteful number, since it uses less digits than its factorization.

11211222120111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1064822 (or 1064813 counting only the distinct ones).

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

Adding to 11211222120111 its reverse (11102122211211), we get a palindrome (22313344331322).

The spelling of 11211222120111 in words is "eleven trillion, two hundred eleven billion, two hundred twenty-two million, one hundred twenty thousand, one hundred eleven".