224005721 has 8 divisors (see below), whose sum is σ = 231404544. Its totient is φ = 216617760.

The previous prime is 224005711. The next prime is 224005741. The reversal of 224005721 is 127500422.

It is a happy number.

224005721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-224005721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (224005711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74381 + ... + 77333.

It is an arithmetic number, because the mean of its divisors is an integer number (28925568).

Almost surely, 2^224005721 is an apocalyptic number.

It is an amenable number.

224005721 is a deficient number, since it is larger than the sum of its proper divisors (7398823).

224005721 is a wasteful number, since it uses less digits than its factorization.

224005721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5431.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 224005721 is about 14966.8206710711. The cubic root of 224005721 is about 607.3229646661.

The spelling of 224005721 in words is "two hundred twenty-four million, five thousand, seven hundred twenty-one".