221242323 has 4 divisors (see below), whose sum is σ = 294989768. Its totient is φ = 147494880.

The previous prime is 221242321. The next prime is 221242337. The reversal of 221242323 is 323242122.

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

It is not a de Polignac number, because 221242323 - 2¹ = 221242321 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 221242323.

It is not an unprimeable number, because it can be changed into a prime (221242321) 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, 36873718 + ... + 36873723.

It is an arithmetic number, because the mean of its divisors is an integer number (73747442).

Almost surely, 2^221242323 is an apocalyptic number.

221242323 is a deficient number, since it is larger than the sum of its proper divisors (73747445).

221242323 is an equidigital number, since it uses as much as digits as its factorization.

221242323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73747444.

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

The square root of 221242323 is about 14874.2167188730. The cubic root of 221242323 is about 604.8152549316.

Adding to 221242323 its reverse (323242122), we get a palindrome (544484445).

The spelling of 221242323 in words is "two hundred twenty-one million, two hundred forty-two thousand, three hundred twenty-three".