223121323 has 4 divisors (see below), whose sum is σ = 226451560. Its totient is φ = 219791088.

The previous prime is 223121287. The next prime is 223121333. The reversal of 223121323 is 323121322.

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

It is a de Polignac number, because none of the positive numbers 2^k-223121323 is a prime.

It is a super-3 number, since 3×223121323³ (a number of 26 digits) contains 333 as substring.

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 223121323.

It is not an unprimeable number, because it can be changed into a prime (223121333) 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, 1665018 + ... + 1665151.

It is an arithmetic number, because the mean of its divisors is an integer number (56612890).

Almost surely, 2^223121323 is an apocalyptic number.

223121323 is a deficient number, since it is larger than the sum of its proper divisors (3330237).

223121323 is an equidigital number, since it uses as much as digits as its factorization.

223121323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3330236.

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

The square root of 223121323 is about 14937.2461652073. The cubic root of 223121323 is about 606.5226523203.

Adding to 223121323 its reverse (323121322), we get a palindrome (546242645).

Subtracting 223121323 from its reverse (323121322), we obtain a palindrome (99999999).

The spelling of 223121323 in words is "two hundred twenty-three million, one hundred twenty-one thousand, three hundred twenty-three".