221232405 has 8 divisors (see below), whose sum is σ = 353971872. Its totient is φ = 117990608.

The previous prime is 221232397. The next prime is 221232437. The reversal of 221232405 is 504232122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221232405 - 2³ = 221232397 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7374399 + ... + 7374428.

It is an arithmetic number, because the mean of its divisors is an integer number (44246484).

Almost surely, 2^221232405 is an apocalyptic number.

It is an amenable number.

221232405 is a deficient number, since it is larger than the sum of its proper divisors (132739467).

221232405 is a wasteful number, since it uses less digits than its factorization.

221232405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14748835.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 221232405 is about 14873.8833194294. The cubic root of 221232405 is about 604.8062171079.

Adding to 221232405 its reverse (504232122), we get a palindrome (725464527).

The spelling of 221232405 in words is "two hundred twenty-one million, two hundred thirty-two thousand, four hundred five".