16346221 has 4 divisors (see below), whose sum is σ = 16361244. Its totient is φ = 16331200.

The previous prime is 16346219. The next prime is 16346243. The reversal of 16346221 is 12264361.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10634121 + 5712100 = 3261^2 + 2390^2 .

It is a cyclic number.

It is not a de Polignac number, because 16346221 - 2¹ = 16346219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16346201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5740 + ... + 8101.

It is an arithmetic number, because the mean of its divisors is an integer number (4090311).

Almost surely, 2^16346221 is an apocalyptic number.

It is an amenable number.

16346221 is a deficient number, since it is larger than the sum of its proper divisors (15023).

16346221 is a wasteful number, since it uses less digits than its factorization.

16346221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15022.

The product of its digits is 1728, while the sum is 25.

The square root of 16346221 is about 4043.0460051798. The cubic root of 16346221 is about 253.7888018511.

The spelling of 16346221 in words is "sixteen million, three hundred forty-six thousand, two hundred twenty-one".