11211122011 has 4 divisors (see below), whose sum is σ = 11215893024. Its totient is φ = 11206351000.

The previous prime is 11211122009. The next prime is 11211122033. The reversal of 11211122011 is 11022111211.

It is a happy number.

11211122011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 11211122011 - 2¹ = 11211122009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11211121982 and 11211122000.

It is not an unprimeable number, because it can be changed into a prime (11211122911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2381980 + ... + 2386681.

It is an arithmetic number, because the mean of its divisors is an integer number (2803973256).

Almost surely, 2^11211122011 is an apocalyptic number.

11211122011 is a deficient number, since it is larger than the sum of its proper divisors (4771013).

11211122011 is an equidigital number, since it uses as much as digits as its factorization.

11211122011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4771012.

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

Adding to 11211122011 its reverse (11022111211), we get a palindrome (22233233222).

The spelling of 11211122011 in words is "eleven billion, two hundred eleven million, one hundred twenty-two thousand, eleven".