221313223 has 4 divisors (see below), whose sum is σ = 222020608. Its totient is φ = 220605840.

The previous prime is 221313193. The next prime is 221313227. The reversal of 221313223 is 322313122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221313223 - 2¹⁷ = 221182151 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221313223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221313227) 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, 353223 + ... + 353848.

It is an arithmetic number, because the mean of its divisors is an integer number (55505152).

Almost surely, 2^221313223 is an apocalyptic number.

221313223 is a deficient number, since it is larger than the sum of its proper divisors (707385).

221313223 is an equidigital number, since it uses as much as digits as its factorization.

221313223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707384.

The product of its digits is 432, while the sum is 19.

The square root of 221313223 is about 14876.5998467392. The cubic root of 221313223 is about 604.8798550213.

Adding to 221313223 its reverse (322313122), we get a palindrome (543626345).

The spelling of 221313223 in words is "two hundred twenty-one million, three hundred thirteen thousand, two hundred twenty-three".