11211123211 has 4 divisors (see below), whose sum is σ = 11279903272. Its totient is φ = 11142343152.

The previous prime is 11211123193. The next prime is 11211123221. The reversal of 11211123211 is 11232111211.

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: 11232111211 = 11903 ⋅943637.

It is a cyclic number.

It is not a de Polignac number, because 11211123211 - 2⁵ = 11211123179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11211123221) 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, 34389786 + ... + 34390111.

It is an arithmetic number, because the mean of its divisors is an integer number (2819975818).

Almost surely, 2^11211123211 is an apocalyptic number.

11211123211 is a deficient number, since it is larger than the sum of its proper divisors (68780061).

11211123211 is an equidigital number, since it uses as much as digits as its factorization.

11211123211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68780060.

The product of its digits is 24, while the sum is 16.

Adding to 11211123211 its reverse (11232111211), we get a palindrome (22443234422).

The spelling of 11211123211 in words is "eleven billion, two hundred eleven million, one hundred twenty-three thousand, two hundred eleven".