221320230 has 32 divisors (see below), whose sum is σ = 533106144. Its totient is φ = 58803456.

The previous prime is 221320223. The next prime is 221320243. The reversal of 221320230 is 32023122.

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5007 + ... + 21626.

It is an arithmetic number, because the mean of its divisors is an integer number (16659567).

Almost surely, 2^221320230 is an apocalyptic number.

221320230 is an abundant number, since it is smaller than the sum of its proper divisors (311785914).

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

221320230 is a wasteful number, since it uses less digits than its factorization.

221320230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26920.

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

The square root of 221320230 is about 14876.8353489578. The cubic root of 221320230 is about 604.8862386562.

Adding to 221320230 its reverse (32023122), we get a palindrome (253343352).

The spelling of 221320230 in words is "two hundred twenty-one million, three hundred twenty thousand, two hundred thirty".