11011211221211 has 16 divisors (see below), whose sum is σ = 11459176147584. Its totient is φ = 10572203201664.

The previous prime is 11011211221183. The next prime is 11011211221229. The reversal of 11011211221211 is 11212211211011.

It is a cyclic number.

It is not a de Polignac number, because 11011211221211 - 2²² = 11011207026907 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11011211221211.

It is not an unprimeable number, because it can be changed into a prime (11011411221211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18936641 + ... + 19509453.

It is an arithmetic number, because the mean of its divisors is an integer number (716198509224).

Almost surely, 2^{11011211221211} is an apocalyptic number.

11011211221211 is a deficient number, since it is larger than the sum of its proper divisors (447964926373).

11011211221211 is an equidigital number, since it uses as much as digits as its factorization.

11011211221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580630.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 11011211221211 its reverse (11212211211011), we get a palindrome (22223422432222).

The spelling of 11011211221211 in words is "eleven trillion, eleven billion, two hundred eleven million, two hundred twenty-one thousand, two hundred eleven".