16000321 has 2 divisors, whose sum is σ = 16000322. Its totient is φ = 16000320.

The previous prime is 16000307. The next prime is 16000339. The reversal of 16000321 is 12300061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15210000 + 790321 = 3900^2 + 889^2 .

It is a cyclic number.

It is not a de Polignac number, because 16000321 - 2⁵ = 16000289 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16000381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8000160 + 8000161.

It is an arithmetic number, because the mean of its divisors is an integer number (8000161).

Almost surely, 2^16000321 is an apocalyptic number.

It is an amenable number.

16000321 is a deficient number, since it is larger than the sum of its proper divisors (1).

16000321 is an equidigital number, since it uses as much as digits as its factorization.

16000321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 16000321 is about 4000.0401247988. The cubic root of 16000321 is about 251.9858951121.

Adding to 16000321 its reverse (12300061), we get a palindrome (28300382).

The spelling of 16000321 in words is "sixteen million, three hundred twenty-one", and thus it is an aban number.