221433404 has 12 divisors (see below), whose sum is σ = 387661344. Its totient is φ = 110673024.

The previous prime is 221433389. The next prime is 221433427. The reversal of 221433404 is 404334122.

It is a self number, because there is not a number n which added to its sum of digits gives 221433404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2252 + ... + 21164.

It is an arithmetic number, because the mean of its divisors is an integer number (32305112).

Almost surely, 2^221433404 is an apocalyptic number.

It is an amenable number.

221433404 is a deficient number, since it is larger than the sum of its proper divisors (166227940).

221433404 is a wasteful number, since it uses less digits than its factorization.

221433404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21844 (or 21842 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 221433404 is about 14880.6385615672. The cubic root of 221433404 is about 604.9893256774.

Adding to 221433404 its reverse (404334122), we get a palindrome (625767526).

The spelling of 221433404 in words is "two hundred twenty-one million, four hundred thirty-three thousand, four hundred four".