11101211111 has 4 divisors (see below), whose sum is σ = 11685485400. Its totient is φ = 10516936824.

The previous prime is 11101211083. The next prime is 11101211129. The reversal of 11101211111 is 11111210111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11111210111 = 27059 ⋅410629.

It is a cyclic number.

It is not a de Polignac number, because 11101211111 - 2¹⁸ = 11100948967 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11101211092 and 11101211101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11101211141) 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 3 ways as a sum of consecutive naturals, for example, 292137116 + ... + 292137153.

It is an arithmetic number, because the mean of its divisors is an integer number (2921371350).

Almost surely, 2^11101211111 is an apocalyptic number.

11101211111 is a deficient number, since it is larger than the sum of its proper divisors (584274289).

11101211111 is an equidigital number, since it uses as much as digits as its factorization.

11101211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584274288.

The product of its (nonzero) digits is 2, while the sum is 11.

Adding to 11101211111 its reverse (11111210111), we get a palindrome (22212421222).

The spelling of 11101211111 in words is "eleven billion, one hundred one million, two hundred eleven thousand, one hundred eleven".