221013424 has 20 divisors (see below), whose sum is σ = 428445544. Its totient is φ = 110446848.

The previous prime is 221013409. The next prime is 221013451. The reversal of 221013424 is 424310122.

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 3 ways as a sum of consecutive naturals, for example, 50824 + ... + 55000.

Almost surely, 2^221013424 is an apocalyptic number.

It is an amenable number.

221013424 is a deficient number, since it is larger than the sum of its proper divisors (207432120).

221013424 is a wasteful number, since it uses less digits than its factorization.

221013424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7492 (or 7486 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 221013424 is about 14866.5202384418. The cubic root of 221013424 is about 604.6066007933.

Adding to 221013424 its reverse (424310122), we get a palindrome (645323546).

The spelling of 221013424 in words is "two hundred twenty-one million, thirteen thousand, four hundred twenty-four".