11211211011 has 256 divisors, whose sum is σ = 22239608832. Its totient is φ = 4835635200.

The previous prime is 11211211001. The next prime is 11211211013. The reversal of 11211211011 is 11011211211.

It is not a de Polignac number, because 11211211011 - 2⁵ = 11211210979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11211211013) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 104777620 + ... + 104777726.

It is an arithmetic number, because the mean of its divisors is an integer number (86873472).

Almost surely, 2^11211211011 is an apocalyptic number.

11211211011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11211211011 is a deficient number, since it is larger than the sum of its proper divisors (11028397821).

11211211011 is a wasteful number, since it uses less digits than its factorization.

11211211011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 11211211011 its reverse (11011211211), we get a palindrome (22222422222).

It can be divided in two parts, 11211 and 211011, that added together give a palindrome (222222).

The spelling of 11211211011 in words is "eleven billion, two hundred eleven million, two hundred eleven thousand, eleven".