11112222102221 has 16 divisors (see below), whose sum is σ = 11531378631168. Its totient is φ = 10696882593600.

The previous prime is 11112222102197. The next prime is 11112222102227. The reversal of 11112222102221 is 12220122221111.

It is a cyclic number.

It is not a de Polignac number, because 11112222102221 - 2¹⁸ = 11112221840077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11112222102193 and 11112222102202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11112222102227) 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, 28650731 + ... + 29035991.

It is an arithmetic number, because the mean of its divisors is an integer number (720711164448).

Almost surely, 2^{11112222102221} is an apocalyptic number.

It is an amenable number.

11112222102221 is a deficient number, since it is larger than the sum of its proper divisors (419156528947).

11112222102221 is a wasteful number, since it uses less digits than its factorization.

11112222102221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390212.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 11112222102221 its reverse (12220122221111), we get a palindrome (23332344323332).

The spelling of 11112222102221 in words is "eleven trillion, one hundred twelve billion, two hundred twenty-two million, one hundred two thousand, two hundred twenty-one".