11111121221011 has 12 divisors (see below), whose sum is σ = 12927781183392. Its totient is φ = 9521902875408.

The previous prime is 11111121221009. The next prime is 11111121221021. The reversal of 11111121221011 is 11012212111111.

11111121221011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11111121221011 - 2¹ = 11111121221009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11111121221021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22555195 + ... + 23042548.

It is an arithmetic number, because the mean of its divisors is an integer number (1077315098616).

Almost surely, 2^{11111121221011} is an apocalyptic number.

11111121221011 is a deficient number, since it is larger than the sum of its proper divisors (1816659962381).

11111121221011 is an equidigital number, since it uses as much as digits as its factorization.

11111121221011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45602730 (or 45602723 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 16.

Adding to 11111121221011 its reverse (11012212111111), we get a palindrome (22123333332122).

The spelling of 11111121221011 in words is "eleven trillion, one hundred eleven billion, one hundred twenty-one million, two hundred twenty-one thousand, eleven".