1211112211 has 4 divisors (see below), whose sum is σ = 1214226000. Its totient is φ = 1207998424.

The previous prime is 1211112163. The next prime is 1211112229. The reversal of 1211112211 is 1122111121.

It is a happy number.

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 1211112211 - 2¹⁷ = 1210981139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211112191 and 1211112200.

It is not an unprimeable number, because it can be changed into a prime (1211112251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1556311 + ... + 1557088.

It is an arithmetic number, because the mean of its divisors is an integer number (303556500).

Almost surely, 2^1211112211 is an apocalyptic number.

1211112211 is a deficient number, since it is larger than the sum of its proper divisors (3113789).

1211112211 is an equidigital number, since it uses as much as digits as its factorization.

1211112211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3113788.

The product of its digits is 8, while the sum is 13.

The square root of 1211112211 is about 34801.0374989022. The cubic root of 1211112211 is about 1065.9286311424.

Adding to 1211112211 its reverse (1122111121), we get a palindrome (2333223332).

The spelling of 1211112211 in words is "one billion, two hundred eleven million, one hundred twelve thousand, two hundred eleven".