221306330 has 16 divisors (see below), whose sum is σ = 455258880. Its totient is φ = 75876432.

The previous prime is 221306321. The next prime is 221306333. The reversal of 221306330 is 33603122.

It is not an unprimeable number, because it can be changed into a prime (221306333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1580690 + ... + 1580829.

It is an arithmetic number, because the mean of its divisors is an integer number (28453680).

Almost surely, 2^221306330 is an apocalyptic number.

221306330 is an abundant number, since it is smaller than the sum of its proper divisors (233952550).

221306330 is a wasteful number, since it uses less digits than its factorization.

221306330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3161533.

The product of its (nonzero) digits is 648, while the sum is 20.

The square root of 221306330 is about 14876.3681723733. The cubic root of 221306330 is about 604.8735751132.

Adding to 221306330 its reverse (33603122), we get a palindrome (254909452).

The spelling of 221306330 in words is "two hundred twenty-one million, three hundred six thousand, three hundred thirty".