16281321 has 16 divisors (see below), whose sum is σ = 24898944. Its totient is φ = 9270144.

The previous prime is 16281319. The next prime is 16281329. The reversal of 16281321 is 12318261.

It is not a de Polignac number, because 16281321 - 2¹ = 16281319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16281291 and 16281300.

It is not an unprimeable number, because it can be changed into a prime (16281329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5335 + ... + 7811.

It is an arithmetic number, because the mean of its divisors is an integer number (1556184).

Almost surely, 2^16281321 is an apocalyptic number.

It is an amenable number.

16281321 is a deficient number, since it is larger than the sum of its proper divisors (8617623).

16281321 is a wasteful number, since it uses less digits than its factorization.

16281321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2800.

The product of its digits is 576, while the sum is 24.

The square root of 16281321 is about 4035.0118958932. The cubic root of 16281321 is about 253.4524806961.

Adding to 16281321 its reverse (12318261), we get a palindrome (28599582).

The spelling of 16281321 in words is "sixteen million, two hundred eighty-one thousand, three hundred twenty-one".