221223330 has 48 divisors (see below), whose sum is σ = 580899384. Its totient is φ = 58406400.

The previous prime is 221223323. The next prime is 221223337. The reversal of 221223330 is 33322122.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (221223323) and next prime (221223337).

It can be written as a sum of positive squares in 4 ways, for example, as 211091841 + 10131489 = 14529^2 + 3183^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221223337) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3079 + ... + 21258.

Almost surely, 2^221223330 is an apocalyptic number.

221223330 is an abundant number, since it is smaller than the sum of its proper divisors (359676054).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221223330 is a wasteful number, since it uses less digits than its factorization.

221223330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24451 (or 24448 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 221223330 is about 14873.5782513826. The cubic root of 221223330 is about 604.7979472352.

Adding to 221223330 its reverse (33322122), we get a palindrome (254545452).

It can be divided in two parts, 22122 and 3330, that added together give a palindrome (25452).

The spelling of 221223330 in words is "two hundred twenty-one million, two hundred twenty-three thousand, three hundred thirty".