224021321 has 4 divisors (see below), whose sum is σ = 224053200. Its totient is φ = 223989444.

The previous prime is 224021279. The next prime is 224021353. The reversal of 224021321 is 123120422.

224021321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 224021321 - 2¹⁰ = 224020297 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 224021321.

It is not an unprimeable number, because it can be changed into a prime (224021521) 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, 251 + ... + 21168.

It is an arithmetic number, because the mean of its divisors is an integer number (56013300).

Almost surely, 2^224021321 is an apocalyptic number.

It is an amenable number.

224021321 is a deficient number, since it is larger than the sum of its proper divisors (31879).

224021321 is a wasteful number, since it uses less digits than its factorization.

224021321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31878.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 224021321 is about 14967.3418147646. The cubic root of 224021321 is about 607.3370625476.

Adding to 224021321 its reverse (123120422), we get a palindrome (347141743).

The spelling of 224021321 in words is "two hundred twenty-four million, twenty-one thousand, three hundred twenty-one".