16041221 has 8 divisors (see below), whose sum is σ = 18414720. Its totient is φ = 13688208.

The previous prime is 16041211. The next prime is 16041247. The reversal of 16041221 is 12214061.

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 16041221 - 2²² = 11846917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16041221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16041211) by changing a digit.

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, 3401 + ... + 6606.

It is an arithmetic number, because the mean of its divisors is an integer number (2301840).

Almost surely, 2^16041221 is an apocalyptic number.

It is an amenable number.

16041221 is a deficient number, since it is larger than the sum of its proper divisors (2373499).

16041221 is a wasteful number, since it uses less digits than its factorization.

16041221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10243.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 16041221 is about 4005.1493105751. The cubic root of 16041221 is about 252.2004210993.

Adding to 16041221 its reverse (12214061), we get a palindrome (28255282).

The spelling of 16041221 in words is "sixteen million, forty-one thousand, two hundred twenty-one".