221330312 has 16 divisors (see below), whose sum is σ = 474279360. Its totient is φ = 94855824.

The previous prime is 221330309. The next prime is 221330339. The reversal of 221330312 is 213033122.

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, 1976108 + ... + 1976219.

It is an arithmetic number, because the mean of its divisors is an integer number (29642460).

Almost surely, 2^221330312 is an apocalyptic number.

It is an amenable number.

221330312 is an abundant number, since it is smaller than the sum of its proper divisors (252949048).

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

221330312 is a wasteful number, since it uses less digits than its factorization.

221330312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3952340 (or 3952336 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 221330312 is about 14877.1741940464. The cubic root of 221330312 is about 604.8954234928.

Adding to 221330312 its reverse (213033122), we get a palindrome (434363434).

The spelling of 221330312 in words is "two hundred twenty-one million, three hundred thirty thousand, three hundred twelve".