221024424 has 32 divisors (see below), whose sum is σ = 560812320. Its totient is φ = 72574656.

The previous prime is 221024413. The next prime is 221024431. The reversal of 221024424 is 424420122.

It is a self number, because there is not a number n which added to its sum of digits gives 221024424.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67119 + ... + 70334.

It is an arithmetic number, because the mean of its divisors is an integer number (17525385).

Almost surely, 2^221024424 is an apocalyptic number.

221024424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

221024424 is an abundant number, since it is smaller than the sum of its proper divisors (339787896).

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

221024424 is a wasteful number, since it uses less digits than its factorization.

221024424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137529 (or 137525 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 21.

The square root of 221024424 is about 14866.8901926395. The cubic root of 221024424 is about 604.6166311981.

Adding to 221024424 its reverse (424420122), we get a palindrome (645444546).

The spelling of 221024424 in words is "two hundred twenty-one million, twenty-four thousand, four hundred twenty-four".