221312330 has 16 divisors (see below), whose sum is σ = 398532960. Its totient is φ = 88486992.

The previous prime is 221312303. The next prime is 221312353. The reversal of 221312330 is 33213122.

221312330 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 221312299 and 221312308.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38717 + ... + 44063.

It is an arithmetic number, because the mean of its divisors is an integer number (24908310).

Almost surely, 2^221312330 is an apocalyptic number.

221312330 is a deficient number, since it is larger than the sum of its proper divisors (177220630).

221312330 is a wasteful number, since it uses less digits than its factorization.

221312330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9493.

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

The square root of 221312330 is about 14876.5698331302. The cubic root of 221312330 is about 604.8790414558.

Adding to 221312330 its reverse (33213122), we get a palindrome (254525452).

The spelling of 221312330 in words is "two hundred twenty-one million, three hundred twelve thousand, three hundred thirty".