221300321 has 8 divisors (see below), whose sum is σ = 241752384. Its totient is φ = 200903920.

The previous prime is 221300309. The next prime is 221300323. The reversal of 221300321 is 123003122.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221300321 - 2¹⁸ = 221038177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221300296 and 221300305.

It is not an unprimeable number, because it can be changed into a prime (221300323) 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, 5366 + ... + 21711.

It is an arithmetic number, because the mean of its divisors is an integer number (30219048).

Almost surely, 2^221300321 is an apocalyptic number.

It is an amenable number.

221300321 is a deficient number, since it is larger than the sum of its proper divisors (20452063).

221300321 is a wasteful number, since it uses less digits than its factorization.

221300321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27831.

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

The square root of 221300321 is about 14876.1662063853. The cubic root of 221300321 is about 604.8681004721.

Adding to 221300321 its reverse (123003122), we get a palindrome (344303443).

The spelling of 221300321 in words is "two hundred twenty-one million, three hundred thousand, three hundred twenty-one".