221530323 has 32 divisors (see below), whose sum is σ = 345945600. Its totient is φ = 126043680.

The previous prime is 221530321. The next prime is 221530357. The reversal of 221530323 is 323035122.

It is not a de Polignac number, because 221530323 - 2¹ = 221530321 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 221530323.

It is not an unprimeable number, because it can be changed into a prime (221530321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 474136 + ... + 474602.

It is an arithmetic number, because the mean of its divisors is an integer number (10810800).

Almost surely, 2^221530323 is an apocalyptic number.

221530323 is a deficient number, since it is larger than the sum of its proper divisors (124415277).

221530323 is an equidigital number, since it uses as much as digits as its factorization.

221530323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952 (or 938 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 21.

The square root of 221530323 is about 14883.8947523825. The cubic root of 221530323 is about 605.0775785589.

Adding to 221530323 its reverse (323035122), we get a palindrome (544565445).

The spelling of 221530323 in words is "two hundred twenty-one million, five hundred thirty thousand, three hundred twenty-three".