223440521 has 8 divisors (see below), whose sum is σ = 229707720. Its totient is φ = 217185408.

The previous prime is 223440457. The next prime is 223440533. The reversal of 223440521 is 125044322.

It is a happy number.

223440521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 30647296 + 192793225 = 5536^2 + 13885^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 223440521 - 2⁶ = 223440457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (223440541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44885 + ... + 49613.

It is an arithmetic number, because the mean of its divisors is an integer number (28713465).

Almost surely, 2^223440521 is an apocalyptic number.

It is an amenable number.

223440521 is a deficient number, since it is larger than the sum of its proper divisors (6267199).

223440521 is a wasteful number, since it uses less digits than its factorization.

223440521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6043.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 223440521 is about 14947.9269800197. The cubic root of 223440521 is about 606.8117455160.

Adding to 223440521 its reverse (125044322), we get a palindrome (348484843).

The spelling of 223440521 in words is "two hundred twenty-three million, four hundred forty thousand, five hundred twenty-one".