224641721 has 4 divisors (see below), whose sum is σ = 225435792. Its totient is φ = 223847652.

The previous prime is 224641673. The next prime is 224641751. The reversal of 224641721 is 127146422.

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 224641721 - 2¹⁰ = 224640697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (224641751) 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, 396611 + ... + 397176.

It is an arithmetic number, because the mean of its divisors is an integer number (56358948).

Almost surely, 2^224641721 is an apocalyptic number.

It is an amenable number.

224641721 is a deficient number, since it is larger than the sum of its proper divisors (794071).

224641721 is an equidigital number, since it uses as much as digits as its factorization.

224641721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794070.

The product of its digits is 5376, while the sum is 29.

The square root of 224641721 is about 14988.0526086613. The cubic root of 224641721 is about 607.8971946807.

The spelling of 224641721 in words is "two hundred twenty-four million, six hundred forty-one thousand, seven hundred twenty-one".