221645384 has 16 divisors (see below), whose sum is σ = 415849200. Its totient is φ = 110752272.

The previous prime is 221645357. The next prime is 221645401. The reversal of 221645384 is 483546122.

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 3 ways as a sum of consecutive naturals, for example, 6047 + ... + 21905.

It is an arithmetic number, because the mean of its divisors is an integer number (25990575).

Almost surely, 2^221645384 is an apocalyptic number.

It is an amenable number.

221645384 is a deficient number, since it is larger than the sum of its proper divisors (194203816).

221645384 is a wasteful number, since it uses less digits than its factorization.

221645384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17612 (or 17608 counting only the distinct ones).

The product of its digits is 46080, while the sum is 35.

The square root of 221645384 is about 14887.7595359409. The cubic root of 221645384 is about 605.1823178414.

The spelling of 221645384 in words is "two hundred twenty-one million, six hundred forty-five thousand, three hundred eighty-four".