2220111111221 has 4 divisors (see below), whose sum is σ = 2220132255072. Its totient is φ = 2220089967372.

The previous prime is 2220111111143. The next prime is 2220111111271. The reversal of 2220111111221 is 1221111110222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2220111111221 - 2²⁶ = 2220044002357 is a prime.

It is a super-2 number, since 2×2220111111221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2220111111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2220111111271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10413635 + ... + 10624688.

It is an arithmetic number, because the mean of its divisors is an integer number (555033063768).

Almost surely, 2^{2220111111221} is an apocalyptic number.

It is an amenable number.

2220111111221 is a deficient number, since it is larger than the sum of its proper divisors (21143851).

2220111111221 is a wasteful number, since it uses less digits than its factorization.

2220111111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21143850.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 2220111111221 its reverse (1221111110222), we get a palindrome (3441222221443).

Subtracting from 2220111111221 its reverse (1221111110222), we obtain a palindrome (999000000999).

It can be divided in two parts, 2220111 and 111221, that added together give a palindrome (2331332).

The spelling of 2220111111221 in words is "two trillion, two hundred twenty billion, one hundred eleven million, one hundred eleven thousand, two hundred twenty-one".