11111020221211 has 4 divisors (see below), whose sum is σ = 11111350654800. Its totient is φ = 11110689787624.

The previous prime is 11111020221187. The next prime is 11111020221227. The reversal of 11111020221211 is 11212202011111.

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 11111020221211 - 2³¹ = 11108872737563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11111020221281) 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, 165166351 + ... + 165233608.

It is an arithmetic number, because the mean of its divisors is an integer number (2777837663700).

Almost surely, 2^{11111020221211} is an apocalyptic number.

11111020221211 is a deficient number, since it is larger than the sum of its proper divisors (330433589).

11111020221211 is an equidigital number, since it uses as much as digits as its factorization.

11111020221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330433588.

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

Adding to 11111020221211 its reverse (11212202011111), we get a palindrome (22323222232322).

The spelling of 11111020221211 in words is "eleven trillion, one hundred eleven billion, twenty million, two hundred twenty-one thousand, two hundred eleven".