224564721007521 has 4 divisors (see below), whose sum is σ = 299419628010032. Its totient is φ = 149709814005012.

The previous prime is 224564721007499. The next prime is 224564721007589. The reversal of 224564721007521 is 125700127465422.

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 224564721007521 - 2²⁵ = 224564687453089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (224564721007621) 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, 37427453501251 + ... + 37427453501256.

It is an arithmetic number, because the mean of its divisors is an integer number (74854907002508).

Almost surely, 2^{224564721007521} is an apocalyptic number.

It is an amenable number.

224564721007521 is a deficient number, since it is larger than the sum of its proper divisors (74854907002511).

224564721007521 is an equidigital number, since it uses as much as digits as its factorization.

224564721007521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74854907002510.

The product of its (nonzero) digits is 1881600, while the sum is 48.

The spelling of 224564721007521 in words is "two hundred twenty-four trillion, five hundred sixty-four billion, seven hundred twenty-one million, seven thousand, five hundred twenty-one".