224345721 has 4 divisors (see below), whose sum is σ = 299127632. Its totient is φ = 149563812.

The previous prime is 224345713. The next prime is 224345747. The reversal of 224345721 is 127543422.

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 not a de Polignac number, because 224345721 - 2³ = 224345713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (224345761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37390951 + ... + 37390956.

It is an arithmetic number, because the mean of its divisors is an integer number (74781908).

Almost surely, 2^224345721 is an apocalyptic number.

It is an amenable number.

224345721 is a deficient number, since it is larger than the sum of its proper divisors (74781911).

224345721 is an equidigital number, since it uses as much as digits as its factorization.

224345721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74781910.

The product of its digits is 13440, while the sum is 30.

The square root of 224345721 is about 14978.1748220536. The cubic root of 224345721 is about 607.6300779900.

The spelling of 224345721 in words is "two hundred twenty-four million, three hundred forty-five thousand, seven hundred twenty-one".