221404430 has 32 divisors (see below), whose sum is σ = 454434624. Its totient is φ = 76939776.

The previous prime is 221404429. The next prime is 221404433. The reversal of 221404430 is 34404122.

221404430 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221404433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47882 + ... + 52301.

It is an arithmetic number, because the mean of its divisors is an integer number (14201082).

Almost surely, 2^221404430 is an apocalyptic number.

221404430 is an abundant number, since it is smaller than the sum of its proper divisors (233030194).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221404430 is a wasteful number, since it uses less digits than its factorization.

221404430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100220.

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

The square root of 221404430 is about 14879.6649827878. The cubic root of 221404430 is about 604.9629374195.

Adding to 221404430 its reverse (34404122), we get a palindrome (255808552).

The spelling of 221404430 in words is "two hundred twenty-one million, four hundred four thousand, four hundred thirty".