2220222221 has 4 divisors (see below), whose sum is σ = 2537396832. Its totient is φ = 1903047612.

The previous prime is 2220222211. The next prime is 2220222247. The reversal of 2220222221 is 1222220222.

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 2220222221 - 2²² = 2216027917 is a prime.

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 2220222221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2220222211) 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, 158587295 + ... + 158587308.

It is an arithmetic number, because the mean of its divisors is an integer number (634349208).

Almost surely, 2^2220222221 is an apocalyptic number.

It is an amenable number.

2220222221 is a deficient number, since it is larger than the sum of its proper divisors (317174611).

2220222221 is an equidigital number, since it uses as much as digits as its factorization.

2220222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317174610.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 2220222221 is about 47119.2340875783. The cubic root of 2220222221 is about 1304.5642758813.

Adding to 2220222221 its reverse (1222220222), we get a palindrome (3442442443).

The spelling of 2220222221 in words is "two billion, two hundred twenty million, two hundred twenty-two thousand, two hundred twenty-one".