224481721 has 4 divisors (see below), whose sum is σ = 232222500. Its totient is φ = 216740944.

The previous prime is 224481667. The next prime is 224481737. The reversal of 224481721 is 127184422.

224481721 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 an emirpimes, since its reverse is a distinct semiprime: 127184422 = 2 ⋅63592211.

It can be written as a sum of positive squares in 2 ways, for example, as 191545600 + 32936121 = 13840^2 + 5739^2 .

It is a cyclic number.

It is not a de Polignac number, because 224481721 - 2¹⁵ = 224448953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (224481781) 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, 3870346 + ... + 3870403.

It is an arithmetic number, because the mean of its divisors is an integer number (58055625).

Almost surely, 2^224481721 is an apocalyptic number.

It is an amenable number.

224481721 is a deficient number, since it is larger than the sum of its proper divisors (7740779).

224481721 is an equidigital number, since it uses as much as digits as its factorization.

224481721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7740778.

The product of its digits is 7168, while the sum is 31.

The square root of 224481721 is about 14982.7140732245. The cubic root of 224481721 is about 607.7528364382.

The spelling of 224481721 in words is "two hundred twenty-four million, four hundred eighty-one thousand, seven hundred twenty-one".