16221065 has 8 divisors (see below), whose sum is σ = 22246080. Its totient is φ = 11122992.

The previous prime is 16221061. The next prime is 16221089. The reversal of 16221065 is 56012261.

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 16221065 - 2² = 16221061 is a prime.

It is a Curzon number.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 16221065.

It is not an unprimeable number, because it can be changed into a prime (16221061) 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 7 ways as a sum of consecutive naturals, for example, 231695 + ... + 231764.

It is an arithmetic number, because the mean of its divisors is an integer number (2780760).

Almost surely, 2^16221065 is an apocalyptic number.

It is an amenable number.

16221065 is a deficient number, since it is larger than the sum of its proper divisors (6025015).

16221065 is an equidigital number, since it uses as much as digits as its factorization.

16221065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463471.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 16221065 is about 4027.5383300473. The cubic root of 16221065 is about 253.1394243673.

The spelling of 16221065 in words is "sixteen million, two hundred twenty-one thousand, sixty-five".