221030321 has 4 divisors (see below), whose sum is σ = 221187072. Its totient is φ = 220873572.

The previous prime is 221030317. The next prime is 221030333. The reversal of 221030321 is 123030122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221030321 - 2² = 221030317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221030296 and 221030305.

It is not an unprimeable number, because it can be changed into a prime (221030351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76241 + ... + 79086.

It is an arithmetic number, because the mean of its divisors is an integer number (55296768).

Almost surely, 2^221030321 is an apocalyptic number.

It is an amenable number.

221030321 is a deficient number, since it is larger than the sum of its proper divisors (156751).

221030321 is a wasteful number, since it uses less digits than its factorization.

221030321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156750.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 221030321 is about 14867.0885179311. The cubic root of 221030321 is about 604.6220082698.

Adding to 221030321 its reverse (123030122), we get a palindrome (344060443).

The spelling of 221030321 in words is "two hundred twenty-one million, thirty thousand, three hundred twenty-one".