11011111011211 has 4 divisors (see below), whose sum is σ = 11124627619672. Its totient is φ = 10897594402752.

The previous prime is 11011111011203. The next prime is 11011111011223. The reversal of 11011111011211 is 11211011111011.

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 11011111011211 - 2³ = 11011111011203 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11011111011191 and 11011111011200.

It is not an unprimeable number, because it can be changed into a prime (11011111011011) 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, 56758304085 + ... + 56758304278.

It is an arithmetic number, because the mean of its divisors is an integer number (2781156904918).

Almost surely, 2^{11011111011211} is an apocalyptic number.

11011111011211 is a deficient number, since it is larger than the sum of its proper divisors (113516608461).

11011111011211 is an equidigital number, since it uses as much as digits as its factorization.

11011111011211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113516608460.

The product of its (nonzero) digits is 2, while the sum is 13.

Adding to 11011111011211 its reverse (11211011111011), we get a palindrome (22222122122222).

The spelling of 11011111011211 in words is "eleven trillion, eleven billion, one hundred eleven million, eleven thousand, two hundred eleven".