221223030 has 64 divisors (see below), whose sum is σ = 609292800. Its totient is φ = 50356224.

The previous prime is 221223029. The next prime is 221223043. The reversal of 221223030 is 30322122.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51921 + ... + 56019.

It is an arithmetic number, because the mean of its divisors is an integer number (9520200).

Almost surely, 2^221223030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221223030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (304646400).

221223030 is an abundant number, since it is smaller than the sum of its proper divisors (388069770).

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

221223030 is a wasteful number, since it uses less digits than its factorization.

221223030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4373.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 221223030 is about 14873.5681663816. The cubic root of 221223030 is about 604.7976738471.

Adding to 221223030 its reverse (30322122), we get a palindrome (251545152).

It can be divided in two parts, 22122 and 3030, that added together give a palindrome (25152).

The spelling of 221223030 in words is "two hundred twenty-one million, two hundred twenty-three thousand, thirty".