221224505 has 16 divisors (see below), whose sum is σ = 282334080. Its totient is φ = 165929472.

The previous prime is 221224483. The next prime is 221224537. The reversal of 221224505 is 505422122.

It is a cyclic number.

It is not a de Polignac number, because 221224505 - 2⁸ = 221224249 is a prime.

It is a super-2 number, since 2×221224505² = 97880563224990050, which contains 22 as substring.

It is a Curzon 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 15 ways as a sum of consecutive naturals, for example, 2789 + ... + 21218.

It is an arithmetic number, because the mean of its divisors is an integer number (17645880).

Almost surely, 2^221224505 is an apocalyptic number.

It is an amenable number.

221224505 is a deficient number, since it is larger than the sum of its proper divisors (61109575).

221224505 is a wasteful number, since it uses less digits than its factorization.

221224505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24128.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 221224505 is about 14873.6177509038. The cubic root of 221224505 is about 604.7990180028.

Adding to 221224505 its reverse (505422122), we get a palindrome (726646627).

The spelling of 221224505 in words is "two hundred twenty-one million, two hundred twenty-four thousand, five hundred five".