221530346 has 8 divisors (see below), whose sum is σ = 335721540. Its totient is φ = 109623168.

The previous prime is 221530321. The next prime is 221530357. The reversal of 221530346 is 643035122.

It can be written as a sum of positive squares in 2 ways, for example, as 196420225 + 25110121 = 14015^2 + 5011^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 570761 + ... + 571148.

Almost surely, 2^221530346 is an apocalyptic number.

221530346 is a deficient number, since it is larger than the sum of its proper divisors (114191194).

221530346 is a wasteful number, since it uses less digits than its factorization.

221530346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1142008.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 221530346 is about 14883.8955250297. The cubic root of 221530346 is about 605.0775994993.

Adding to 221530346 its reverse (643035122), we get a palindrome (864565468).

The spelling of 221530346 in words is "two hundred twenty-one million, five hundred thirty thousand, three hundred forty-six".