221333441 has 16 divisors (see below), whose sum is σ = 260198400. Its totient is φ = 188183520.

The previous prime is 221333389. The next prime is 221333449. The reversal of 221333441 is 144333122.

It is not a de Polignac number, because 221333441 - 2⁶ = 221333377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221333449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41021 + ... + 46101.

It is an arithmetic number, because the mean of its divisors is an integer number (16262400).

Almost surely, 2^221333441 is an apocalyptic number.

It is an amenable number.

221333441 is a deficient number, since it is larger than the sum of its proper divisors (38864959).

221333441 is an equidigital number, since it uses as much as digits as its factorization.

221333441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5229 (or 5215 counting only the distinct ones).

The product of its digits is 1728, while the sum is 23.

The square root of 221333441 is about 14877.2793547745. The cubic root of 221333441 is about 604.8982739969.

Adding to 221333441 its reverse (144333122), we get a palindrome (365666563).

The spelling of 221333441 in words is "two hundred twenty-one million, three hundred thirty-three thousand, four hundred forty-one".