221434005 has 32 divisors (see below), whose sum is σ = 382435200. Its totient is φ = 108760320.

The previous prime is 221434001. The next prime is 221434007. The reversal of 221434005 is 500434122.

It is not a de Polignac number, because 221434005 - 2² = 221434001 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221434001) 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 in 31 ways as a sum of consecutive naturals, for example, 104446 + ... + 106544.

It is an arithmetic number, because the mean of its divisors is an integer number (11951100).

Almost surely, 2^221434005 is an apocalyptic number.

It is an amenable number.

221434005 is a deficient number, since it is larger than the sum of its proper divisors (161001195).

221434005 is a wasteful number, since it uses less digits than its factorization.

221434005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2661.

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

The square root of 221434005 is about 14880.6587555793. The cubic root of 221434005 is about 604.9898730177.

Adding to 221434005 its reverse (500434122), we get a palindrome (721868127).

The spelling of 221434005 in words is "two hundred twenty-one million, four hundred thirty-four thousand, five".