221224256 has 28 divisors (see below), whose sum is σ = 478901760. Its totient is φ = 100556160.

The previous prime is 221224249. The next prime is 221224261. The reversal of 221224256 is 652422122.

221224256 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156416 + ... + 157823.

Almost surely, 2^221224256 is an apocalyptic number.

It is an amenable number.

221224256 is an abundant number, since it is smaller than the sum of its proper divisors (257677504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221224256 is a wasteful number, since it uses less digits than its factorization.

221224256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314262 (or 314252 counting only the distinct ones).

The product of its digits is 3840, while the sum is 26.

The square root of 221224256 is about 14873.6093803757. The cubic root of 221224256 is about 604.7987910915.

Adding to 221224256 its reverse (652422122), we get a palindrome (873646378).

The spelling of 221224256 in words is "two hundred twenty-one million, two hundred twenty-four thousand, two hundred fifty-six".