221473924 has 27 divisors (see below), whose sum is σ = 451282167. Its totient is φ = 94828104.

The previous prime is 221473913. The next prime is 221473933. The reversal of 221473924 is 429374122.

The square root of 221473924 is 14882.

It is a perfect power (a square), and thus also a powerful number.

It is a self number, because there is not a number n which added to its sum of digits gives 221473924.

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 8 ways as a sum of consecutive naturals, for example, 207817 + ... + 208879.

Almost surely, 2^221473924 is an apocalyptic number.

221473924 is the 14882-nd square number.

It is an amenable number.

221473924 is an abundant number, since it is smaller than the sum of its proper divisors (229808243).

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

221473924 is an equidigital number, since it uses as much as digits as its factorization.

221473924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2144 (or 1072 counting only the distinct ones).

The product of its digits is 24192, while the sum is 34.

The cubic root of 221473924 is about 605.0262256691.

The spelling of 221473924 in words is "two hundred twenty-one million, four hundred seventy-three thousand, nine hundred twenty-four".