221441321 has 4 divisors (see below), whose sum is σ = 221683200. Its totient is φ = 221199444.

The previous prime is 221441237. The next prime is 221441377. The reversal of 221441321 is 123144122.

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 221441321 - 2²⁶ = 154332457 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221441293 and 221441302.

It is not an unprimeable number, because it can be changed into a prime (221441621) 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, 119561 + ... + 121398.

It is an arithmetic number, because the mean of its divisors is an integer number (55420800).

Almost surely, 2^221441321 is an apocalyptic number.

It is an amenable number.

221441321 is a deficient number, since it is larger than the sum of its proper divisors (241879).

221441321 is an equidigital number, since it uses as much as digits as its factorization.

221441321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241878.

The product of its digits is 384, while the sum is 20.

The square root of 221441321 is about 14880.9045759994. The cubic root of 221441321 is about 604.9965357359.

Adding to 221441321 its reverse (123144122), we get a palindrome (344585443).

The spelling of 221441321 in words is "two hundred twenty-one million, four hundred forty-one thousand, three hundred twenty-one".