221500230 has 64 divisors (see below), whose sum is σ = 612057600. Its totient is φ = 50252544.

The previous prime is 221500207. The next prime is 221500261. The reversal of 221500230 is 32005122.

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

It is a Curzon number.

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, 24921 + ... + 32619.

It is an arithmetic number, because the mean of its divisors is an integer number (9563400).

Almost surely, 2^221500230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221500230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (306028800).

221500230 is an abundant number, since it is smaller than the sum of its proper divisors (390557370).

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

221500230 is a wasteful number, since it uses less digits than its factorization.

221500230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7853.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 221500230 is about 14882.8837931363. The cubic root of 221500230 is about 605.0501791133.

Adding to 221500230 its reverse (32005122), we get a palindrome (253505352).

The spelling of 221500230 in words is "two hundred twenty-one million, five hundred thousand, two hundred thirty".