224312521 has 4 divisors (see below), whose sum is σ = 227152000. Its totient is φ = 221473044.

The previous prime is 224312471. The next prime is 224312527. The reversal of 224312521 is 125213422.

It is a happy number.

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 224312521 - 2⁷ = 224312393 is a prime.

It is a super-2 number, since 2×224312521² = 100632214154750882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 224312492 and 224312501.

It is not an unprimeable number, because it can be changed into a prime (224312527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1419621 + ... + 1419778.

It is an arithmetic number, because the mean of its divisors is an integer number (56788000).

Almost surely, 2^224312521 is an apocalyptic number.

It is an amenable number.

224312521 is a deficient number, since it is larger than the sum of its proper divisors (2839479).

224312521 is an equidigital number, since it uses as much as digits as its factorization.

224312521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2839478.

The product of its digits is 960, while the sum is 22.

The square root of 224312521 is about 14977.0665018220. The cubic root of 224312521 is about 607.6001029531.

Adding to 224312521 its reverse (125213422), we get a palindrome (349525943).

Subtracting from 224312521 its reverse (125213422), we obtain a palindrome (99099099).

The spelling of 224312521 in words is "two hundred twenty-four million, three hundred twelve thousand, five hundred twenty-one".