2220222111221 has 4 divisors (see below), whose sum is σ = 2237170371744. Its totient is φ = 2203273850700.

The previous prime is 2220222111209. The next prime is 2220222111223. The reversal of 2220222111221 is 1221112220222.

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 2220222111221 - 2¹⁴ = 2220222094837 is a prime.

It is a super-2 number, since 2×2220222111221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2220222111193 and 2220222111202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2220222111223) 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, 8474130065 + ... + 8474130326.

It is an arithmetic number, because the mean of its divisors is an integer number (559292592936).

Almost surely, 2^{2220222111221} is an apocalyptic number.

It is an amenable number.

2220222111221 is a deficient number, since it is larger than the sum of its proper divisors (16948260523).

2220222111221 is a wasteful number, since it uses less digits than its factorization.

2220222111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16948260522.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 2220222111221 its reverse (1221112220222), we get a palindrome (3441334331443).

The spelling of 2220222111221 in words is "two trillion, two hundred twenty billion, two hundred twenty-two million, one hundred eleven thousand, two hundred twenty-one".