11220111122221 has 16 divisors (see below), whose sum is σ = 11295632646144. Its totient is φ = 11144791292544.

The previous prime is 11220111122219. The next prime is 11220111122237. The reversal of 11220111122221 is 12222111102211.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 11220111122221 - 2¹ = 11220111122219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11220111122281) 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, 336489076 + ... + 336522418.

It is an arithmetic number, because the mean of its divisors is an integer number (705977040384).

Almost surely, 2^{11220111122221} is an apocalyptic number.

It is an amenable number.

11220111122221 is a deficient number, since it is larger than the sum of its proper divisors (75521523923).

11220111122221 is a wasteful number, since it uses less digits than its factorization.

11220111122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36300.

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

Adding to 11220111122221 its reverse (12222111102211), we get a palindrome (23442222224432).

The spelling of 11220111122221 in words is "eleven trillion, two hundred twenty billion, one hundred eleven million, one hundred twenty-two thousand, two hundred twenty-one".