221424472 has 16 divisors (see below), whose sum is σ = 415373400. Its totient is φ = 110658240.

The previous prime is 221424443. The next prime is 221424491. The reversal of 221424472 is 274424122.

221424472 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×221424472³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221424472.

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, 14679 + ... + 25657.

Almost surely, 2^221424472 is an apocalyptic number.

It is an amenable number.

221424472 is a deficient number, since it is larger than the sum of its proper divisors (193948928).

221424472 is a wasteful number, since it uses less digits than its factorization.

221424472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13506 (or 13502 counting only the distinct ones).

The product of its digits is 7168, while the sum is 28.

The square root of 221424472 is about 14880.3384370114. The cubic root of 221424472 is about 604.9811910461.

Adding to 221424472 its reverse (274424122), we get a palindrome (495848594).

The spelling of 221424472 in words is "two hundred twenty-one million, four hundred twenty-four thousand, four hundred seventy-two".