221424530256 has 100 divisors (see below), whose sum is σ = 678564947412. Its totient is φ = 69466512384.

The previous prime is 221424530237. The next prime is 221424530267. The reversal of 221424530256 is 652035424122.

221424530256 is a `hidden beast` number, since 221 + 42 + 45 + 302 + 56 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 93503854656 + 127920675600 = 305784^2 + 357660^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 221424530256.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5003035 + ... + 5047098.

Almost surely, 2^221424530256 is an apocalyptic number.

It is an amenable number.

221424530256 is an abundant number, since it is smaller than the sum of its proper divisors (457140417156).

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

221424530256 is a wasteful number, since it uses less digits than its factorization.

221424530256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10050170 (or 10050155 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

Adding to 221424530256 its reverse (652035424122), we get a palindrome (873459954378).

The spelling of 221424530256 in words is "two hundred twenty-one billion, four hundred twenty-four million, five hundred thirty thousand, two hundred fifty-six".