221222211 has 48 divisors (see below), whose sum is σ = 364435200. Its totient is φ = 118759872.

The previous prime is 221222203. The next prime is 221222213. The reversal of 221222211 is 112222122.

It is not a de Polignac number, because 221222211 - 2³ = 221222203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221222213) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 198925 + ... + 200033.

It is an arithmetic number, because the mean of its divisors is an integer number (7592400).

Almost surely, 2^221222211 is an apocalyptic number.

221222211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

221222211 is a deficient number, since it is larger than the sum of its proper divisors (143212989).

221222211 is a wasteful number, since it uses less digits than its factorization.

221222211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1208 (or 1201 counting only the distinct ones).

The product of its digits is 64, while the sum is 15.

The square root of 221222211 is about 14873.5406342942. The cubic root of 221222211 is about 604.7969274964.

Adding to 221222211 its reverse (112222122), we get a palindrome (333444333).

The spelling of 221222211 in words is "two hundred twenty-one million, two hundred twenty-two thousand, two hundred eleven".