111100211221211 has 4 divisors (see below), whose sum is σ = 112665002928624. Its totient is φ = 109535419513800.

The previous prime is 111100211221189. The next prime is 111100211221231. The reversal of 111100211221211 is 112122112001111.

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-111100211221211 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 111100211221211.

It is not an unprimeable number, because it can be changed into a prime (111100211221231) 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, 782395853600 + ... + 782395853741.

It is an arithmetic number, because the mean of its divisors is an integer number (28166250732156).

Almost surely, 2^{111100211221211} is an apocalyptic number.

111100211221211 is a deficient number, since it is larger than the sum of its proper divisors (1564791707413).

111100211221211 is an equidigital number, since it uses as much as digits as its factorization.

111100211221211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1564791707412.

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

Adding to 111100211221211 its reverse (112122112001111), we get a palindrome (223222323222322).

The spelling of 111100211221211 in words is "one hundred eleven trillion, one hundred billion, two hundred eleven million, two hundred twenty-one thousand, two hundred eleven".