16347921 has 8 divisors (see below), whose sum is σ = 21848640. Its totient is φ = 10872912.

The previous prime is 16347913. The next prime is 16347941. The reversal of 16347921 is 12974361.

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

It is not a de Polignac number, because 16347921 - 2³ = 16347913 is a prime.

It is a Curzon number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (16347901) 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, 4890 + ... + 7523.

It is an arithmetic number, because the mean of its divisors is an integer number (2731080).

Almost surely, 2^16347921 is an apocalyptic number.

It is an amenable number.

16347921 is a deficient number, since it is larger than the sum of its proper divisors (5500719).

16347921 is a wasteful number, since it uses less digits than its factorization.

16347921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12855.

The product of its digits is 9072, while the sum is 33.

The square root of 16347921 is about 4043.2562372425. The cubic root of 16347921 is about 253.7975995217.

It can be divided in two parts, 163 and 47921, that added together give a palindrome (48084).

The spelling of 16347921 in words is "sixteen million, three hundred forty-seven thousand, nine hundred twenty-one".