221310004 has 6 divisors (see below), whose sum is σ = 387292514. Its totient is φ = 110655000.

The previous prime is 221309989. The next prime is 221310031. The reversal of 221310004 is 400013122.

221310004 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 205865104 + 15444900 = 14348^2 + 3930^2 .

It is a congruent number.

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 as a sum of consecutive naturals, namely, 27663747 + ... + 27663754.

Almost surely, 2^221310004 is an apocalyptic number.

It is an amenable number.

221310004 is a deficient number, since it is larger than the sum of its proper divisors (165982510).

221310004 is a wasteful number, since it uses less digits than its factorization.

221310004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55327505 (or 55327503 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 221310004 is about 14876.4916563012. The cubic root of 221310004 is about 604.8769223487.

Adding to 221310004 its reverse (400013122), we get a palindrome (621323126).

The spelling of 221310004 in words is "two hundred twenty-one million, three hundred ten thousand, four".