11112221102221 has 4 divisors (see below), whose sum is σ = 11383250885244. Its totient is φ = 10841191319200.

The previous prime is 11112221102197. The next prime is 11112221102299. The reversal of 11112221102221 is 12220112221111.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1384128720100 + 9728092382121 = 1176490^2 + 3118989^2 .

It is a cyclic number.

It is not a de Polignac number, because 11112221102221 - 2³⁵ = 11077861363853 is a prime.

It is a super-2 number, since 2×11112221102221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11112221102621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135514891450 + ... + 135514891531.

It is an arithmetic number, because the mean of its divisors is an integer number (2845812721311).

Almost surely, 2^{11112221102221} is an apocalyptic number.

It is an amenable number.

11112221102221 is a deficient number, since it is larger than the sum of its proper divisors (271029783023).

11112221102221 is an equidigital number, since it uses as much as digits as its factorization.

11112221102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271029783022.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 11112221102221 its reverse (12220112221111), we get a palindrome (23332333323332).

The spelling of 11112221102221 in words is "eleven trillion, one hundred twelve billion, two hundred twenty-one million, one hundred two thousand, two hundred twenty-one".