11111011211 has 4 divisors (see below), whose sum is σ = 11111232624. Its totient is φ = 11110789800.

The previous prime is 11111011207. The next prime is 11111011243. The reversal of 11111011211 is 11211011111.

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: 11211011111 = 1193 ⋅9397327.

It is a cyclic number.

It is not a de Polignac number, because 11111011211 - 2² = 11111011207 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11111011192 and 11111011201.

It is not an unprimeable number, because it can be changed into a prime (11111011291) 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, 4601 + ... + 149141.

It is an arithmetic number, because the mean of its divisors is an integer number (2777808156).

Almost surely, 2^11111011211 is an apocalyptic number.

11111011211 is a deficient number, since it is larger than the sum of its proper divisors (221413).

11111011211 is an equidigital number, since it uses as much as digits as its factorization.

11111011211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221412.

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

Adding to 11111011211 its reverse (11211011111), we get a palindrome (22322022322).

The spelling of 11111011211 in words is "eleven billion, one hundred eleven million, eleven thousand, two hundred eleven".