224012521 has 4 divisors (see below), whose sum is σ = 224064000. Its totient is φ = 223961044.

The previous prime is 224012513. The next prime is 224012531. The reversal of 224012521 is 125210422.

224012521 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 a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 125210422 = 2 ⋅62605211.

It is a cyclic number.

It is not a de Polignac number, because 224012521 - 2³ = 224012513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (224012531) 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, 18541 + ... + 28138.

It is an arithmetic number, because the mean of its divisors is an integer number (56016000).

Almost surely, 2^224012521 is an apocalyptic number.

It is an amenable number.

224012521 is a deficient number, since it is larger than the sum of its proper divisors (51479).

224012521 is an equidigital number, since it uses as much as digits as its factorization.

224012521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51478.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 224012521 is about 14967.0478385018. The cubic root of 224012521 is about 607.3291099770.

Adding to 224012521 its reverse (125210422), we get a palindrome (349222943).

The spelling of 224012521 in words is "two hundred twenty-four million, twelve thousand, five hundred twenty-one".