221649304 has 16 divisors (see below), whose sum is σ = 415753200. Its totient is φ = 110781792.

The previous prime is 221649301. The next prime is 221649331. The reversal of 221649304 is 403946122.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221649301) by changing a digit.

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, 31677 + ... + 38035.

It is an arithmetic number, because the mean of its divisors is an integer number (25984575).

Almost surely, 2^221649304 is an apocalyptic number.

It is an amenable number.

221649304 is a deficient number, since it is larger than the sum of its proper divisors (194103896).

221649304 is a wasteful number, since it uses less digits than its factorization.

221649304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10722 (or 10718 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 221649304 is about 14887.8911871359. The cubic root of 221649304 is about 605.1858855534.

The spelling of 221649304 in words is "two hundred twenty-one million, six hundred forty-nine thousand, three hundred four".