331221223 has 4 divisors (see below), whose sum is σ = 331265200. Its totient is φ = 331177248.

The previous prime is 331221203. The next prime is 331221239. The reversal of 331221223 is 322122133.

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 331221223 - 2²¹ = 329124071 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 331221223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331221203) 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, 7515 + ... + 26812.

It is an arithmetic number, because the mean of its divisors is an integer number (82816300).

Almost surely, 2^331221223 is an apocalyptic number.

331221223 is a deficient number, since it is larger than the sum of its proper divisors (43977).

331221223 is an equidigital number, since it uses as much as digits as its factorization.

331221223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43976.

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

The square root of 331221223 is about 18199.4841410409. The cubic root of 331221223 is about 691.8937148123.

Adding to 331221223 its reverse (322122133), we get a palindrome (653343356).

The spelling of 331221223 in words is "three hundred thirty-one million, two hundred twenty-one thousand, two hundred twenty-three".