221004434 has 64 divisors (see below), whose sum is σ = 405098496. Its totient is φ = 88470144.

The previous prime is 221004431. The next prime is 221004449. The reversal of 221004434 is 434400122.

221004434 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221004431) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 2065409 + ... + 2065515.

It is an arithmetic number, because the mean of its divisors is an integer number (6329664).

Almost surely, 2^221004434 is an apocalyptic number.

221004434 is a deficient number, since it is larger than the sum of its proper divisors (184094062).

221004434 is a wasteful number, since it uses less digits than its factorization.

221004434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 221004434 is about 14866.2178781289. The cubic root of 221004434 is about 604.5984029700.

Adding to 221004434 its reverse (434400122), we get a palindrome (655404556).

The spelling of 221004434 in words is "two hundred twenty-one million, four thousand, four hundred thirty-four".