224223521 has 4 divisors (see below), whose sum is σ = 224532672. Its totient is φ = 223914372.

The previous prime is 224223499. The next prime is 224223539. The reversal of 224223521 is 125322422.

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.

It is a cyclic number.

It is not a de Polignac number, because 224223521 - 2¹⁰ = 224222497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (224223221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153485 + ... + 154938.

It is an arithmetic number, because the mean of its divisors is an integer number (56133168).

Almost surely, 2^224223521 is an apocalyptic number.

It is an amenable number.

224223521 is a deficient number, since it is larger than the sum of its proper divisors (309151).

224223521 is an equidigital number, since it uses as much as digits as its factorization.

224223521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309150.

The product of its digits is 1920, while the sum is 23.

The square root of 224223521 is about 14974.0949976952. The cubic root of 224223521 is about 607.5197335910.

Adding to 224223521 its reverse (125322422), we get a palindrome (349545943).

The spelling of 224223521 in words is "two hundred twenty-four million, two hundred twenty-three thousand, five hundred twenty-one".