221144065 has 8 divisors (see below), whose sum is σ = 265471488. Its totient is φ = 176849520.

The previous prime is 221144047. The next prime is 221144087. The reversal of 221144065 is 560441122.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-221144065 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 10434 + ... + 23476.

It is an arithmetic number, because the mean of its divisors is an integer number (33183936).

Almost surely, 2^221144065 is an apocalyptic number.

It is an amenable number.

221144065 is a deficient number, since it is larger than the sum of its proper divisors (44327423).

221144065 is a wasteful number, since it uses less digits than its factorization.

221144065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16439.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 221144065 is about 14870.9133882220. The cubic root of 221144065 is about 604.7257049510.

Adding to 221144065 its reverse (560441122), we get a palindrome (781585187).

The spelling of 221144065 in words is "two hundred twenty-one million, one hundred forty-four thousand, sixty-five".