2222231221 has 4 divisors (see below), whose sum is σ = 2539692832. Its totient is φ = 1904769612.

The previous prime is 2222231183. The next prime is 2222231233. The reversal of 2222231221 is 1221322222.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1221322222 = 2 ⋅610661111.

It is a cyclic number.

It is not a de Polignac number, because 2222231221 - 2²³ = 2213842613 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 (2222231021) 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, 158730795 + ... + 158730808.

It is an arithmetic number, because the mean of its divisors is an integer number (634923208).

Almost surely, 2^2222231221 is an apocalyptic number.

It is an amenable number.

2222231221 is a deficient number, since it is larger than the sum of its proper divisors (317461611).

2222231221 is an equidigital number, since it uses as much as digits as its factorization.

2222231221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317461610.

The product of its digits is 384, while the sum is 19.

The square root of 2222231221 is about 47140.5475254584. The cubic root of 2222231221 is about 1304.9576418384.

Adding to 2222231221 its reverse (1221322222), we get a palindrome (3443553443).

The spelling of 2222231221 in words is "two billion, two hundred twenty-two million, two hundred thirty-one thousand, two hundred twenty-one".