221504648 has 16 divisors (see below), whose sum is σ = 415633680. Its totient is φ = 110669008.

The previous prime is 221504627. The next prime is 221504669. The reversal of 221504648 is 846405122.

It is an interprime number because it is at equal distance from previous prime (221504627) and next prime (221504669).

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, 1715 + ... + 21117.

It is an arithmetic number, because the mean of its divisors is an integer number (25977105).

Almost surely, 2^221504648 is an apocalyptic number.

It is an amenable number.

221504648 is a deficient number, since it is larger than the sum of its proper divisors (194129032).

221504648 is a wasteful number, since it uses less digits than its factorization.

221504648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20836 (or 20832 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 221504648 is about 14883.0322179319. The cubic root of 221504648 is about 605.0542018238.

The spelling of 221504648 in words is "two hundred twenty-one million, five hundred four thousand, six hundred forty-eight".