221425504 has 12 divisors (see below), whose sum is σ = 435931524. Its totient is φ = 110712736.

The previous prime is 221425483. The next prime is 221425511. The reversal of 221425504 is 405524122.

221425504 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3459742 + ... + 3459805.

It is an arithmetic number, because the mean of its divisors is an integer number (36327627).

Almost surely, 2^221425504 is an apocalyptic number.

It is an amenable number.

221425504 is a deficient number, since it is larger than the sum of its proper divisors (214506020).

221425504 is an equidigital number, since it uses as much as digits as its factorization.

221425504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6919557 (or 6919549 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 221425504 is about 14880.3731136017. The cubic root of 221425504 is about 604.9821309296.

Adding to 221425504 its reverse (405524122), we get a palindrome (626949626).

The spelling of 221425504 in words is "two hundred twenty-one million, four hundred twenty-five thousand, five hundred four".