221424450 has 96 divisors (see below), whose sum is σ = 617210496. Its totient is φ = 52124160.

The previous prime is 221424443. The next prime is 221424491. The reversal of 221424450 is 54424122.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 221424450.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 42382 + ... + 47318.

It is an arithmetic number, because the mean of its divisors is an integer number (6429276).

Almost surely, 2^221424450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221424450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (308605248).

221424450 is an abundant number, since it is smaller than the sum of its proper divisors (395786046).

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

221424450 is a wasteful number, since it uses less digits than its factorization.

221424450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4988 (or 4983 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 24.

The square root of 221424450 is about 14880.3376977809. The cubic root of 221424450 is about 604.9811710098.

Adding to 221424450 its reverse (54424122), we get a palindrome (275848572).

The spelling of 221424450 in words is "two hundred twenty-one million, four hundred twenty-four thousand, four hundred fifty".