221221223 has 4 divisors (see below), whose sum is σ = 221605200. Its totient is φ = 220837248.

The previous prime is 221221219. The next prime is 221221243. The reversal of 221221223 is 322122122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221221223 - 2² = 221221219 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 (221221213) 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, 191123 + ... + 192276.

It is an arithmetic number, because the mean of its divisors is an integer number (55401300).

Almost surely, 2^221221223 is an apocalyptic number.

221221223 is a deficient number, since it is larger than the sum of its proper divisors (383977).

221221223 is an equidigital number, since it uses as much as digits as its factorization.

221221223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383976.

The product of its digits is 192, while the sum is 17.

The square root of 221221223 is about 14873.5074209145. The cubic root of 221221223 is about 604.7960271343.

Adding to 221221223 its reverse (322122122), we get a palindrome (543343345).

It can be divided in two parts, 22122122 and 3, that multiplied together give a palindrome (66366366).

The spelling of 221221223 in words is "two hundred twenty-one million, two hundred twenty-one thousand, two hundred twenty-three".