221430004 has 6 divisors (see below), whose sum is σ = 387502514. Its totient is φ = 110715000.

The previous prime is 221429987. The next prime is 221430007. The reversal of 221430004 is 400034122.

It can be written as a sum of positive squares in only one way, i.e., 195440400 + 25989604 = 13980^2 + 5098^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221430004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221430007) 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 as a sum of consecutive naturals, namely, 27678747 + ... + 27678754.

Almost surely, 2^221430004 is an apocalyptic number.

It is an amenable number.

221430004 is a deficient number, since it is larger than the sum of its proper divisors (166072510).

221430004 is a wasteful number, since it uses less digits than its factorization.

221430004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55357505 (or 55357503 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 221430004 is about 14880.5243187194. The cubic root of 221430004 is about 604.9862292246.

Adding to 221430004 its reverse (400034122), we get a palindrome (621464126).

The spelling of 221430004 in words is "two hundred twenty-one million, four hundred thirty thousand, four".