111211222211 has 4 divisors (see below), whose sum is σ = 114798681024. Its totient is φ = 107623763400.

The previous prime is 111211222207. The next prime is 111211222229. The reversal of 111211222211 is 112222112111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 111211222211 - 2² = 111211222207 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 111211222211.

It is not an unprimeable number, because it can be changed into a prime (111211222201) 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, 1793729360 + ... + 1793729421.

It is an arithmetic number, because the mean of its divisors is an integer number (28699670256).

Almost surely, 2^111211222211 is an apocalyptic number.

111211222211 is a deficient number, since it is larger than the sum of its proper divisors (3587458813).

111211222211 is an equidigital number, since it uses as much as digits as its factorization.

111211222211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3587458812.

The product of its digits is 32, while the sum is 17.

Adding to 111211222211 its reverse (112222112111), we get a palindrome (223433334322).

The spelling of 111211222211 in words is "one hundred eleven billion, two hundred eleven million, two hundred twenty-two thousand, two hundred eleven".