221234321 has 16 divisors (see below), whose sum is σ = 284725248. Its totient is φ = 166827600.

The previous prime is 221234317. The next prime is 221234327. The reversal of 221234321 is 123432122.

221234321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 221234321 - 2² = 221234317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221234293 and 221234302.

It is not an unprimeable number, because it can be changed into a prime (221234327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43955 + ... + 48728.

It is an arithmetic number, because the mean of its divisors is an integer number (17795328).

Almost surely, 2^221234321 is an apocalyptic number.

It is an amenable number.

221234321 is a deficient number, since it is larger than the sum of its proper divisors (63490927).

221234321 is a wasteful number, since it uses less digits than its factorization.

221234321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92732.

The product of its digits is 576, while the sum is 20.

The square root of 221234321 is about 14873.9477274865. The cubic root of 221234321 is about 604.8079630929.

Adding to 221234321 its reverse (123432122), we get a palindrome (344666443).

The spelling of 221234321 in words is "two hundred twenty-one million, two hundred thirty-four thousand, three hundred twenty-one".