16321530 has 32 divisors (see below), whose sum is σ = 41477184. Its totient is φ = 4096256.

The previous prime is 16321507. The next prime is 16321537. The reversal of 16321530 is 3512361.

It is a junction number, because it is equal to n+sod(n) for n = 16321497 and 16321506.

It is not an unprimeable number, because it can be changed into a prime (16321537) 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, 15492 + ... + 16511.

It is an arithmetic number, because the mean of its divisors is an integer number (1296162).

Almost surely, 2^16321530 is an apocalyptic number.

16321530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16321530 is an abundant number, since it is smaller than the sum of its proper divisors (25155654).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16321530 is a wasteful number, since it uses less digits than its factorization.

16321530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32030.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 16321530 is about 4039.9913366244. The cubic root of 16321530 is about 253.6609546248.

Adding to 16321530 its reverse (3512361), we get a palindrome (19833891).

The spelling of 16321530 in words is "sixteen million, three hundred twenty-one thousand, five hundred thirty".