221223423 has 4 divisors (see below), whose sum is σ = 294964568. Its totient is φ = 147482280.

The previous prime is 221223421. The next prime is 221223451. The reversal of 221223423 is 324322122.

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

It is not a de Polignac number, because 221223423 - 2¹ = 221223421 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 221223423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221223421) 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, 36870568 + ... + 36870573.

It is an arithmetic number, because the mean of its divisors is an integer number (73741142).

Almost surely, 2^221223423 is an apocalyptic number.

221223423 is a deficient number, since it is larger than the sum of its proper divisors (73741145).

221223423 is an equidigital number, since it uses as much as digits as its factorization.

221223423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73741144.

The product of its digits is 1152, while the sum is 21.

The square root of 221223423 is about 14873.5813777315. The cubic root of 221223423 is about 604.7980319855.

Adding to 221223423 its reverse (324322122), we get a palindrome (545545545).

The spelling of 221223423 in words is "two hundred twenty-one million, two hundred twenty-three thousand, four hundred twenty-three".