16130321 has 4 divisors (see below), whose sum is σ = 16139700. Its totient is φ = 16120944.

The previous prime is 16130311. The next prime is 16130327. The reversal of 16130321 is 12303161.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12303161 = 13 ⋅946397.

It can be written as a sum of positive squares in 2 ways, for example, as 1392400 + 14737921 = 1180^2 + 3839^2 .

It is a cyclic number.

It is not a de Polignac number, because 16130321 - 2¹⁰ = 16129297 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 16130321.

It is not an unprimeable number, because it can be changed into a prime (16130327) 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, 1286 + ... + 5823.

It is an arithmetic number, because the mean of its divisors is an integer number (4034925).

Almost surely, 2^16130321 is an apocalyptic number.

It is an amenable number.

16130321 is a deficient number, since it is larger than the sum of its proper divisors (9379).

16130321 is an equidigital number, since it uses as much as digits as its factorization.

16130321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9378.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 16130321 is about 4016.2570883847. The cubic root of 16130321 is about 252.6665032576. Note that the first 3 decimals are identical.

Adding to 16130321 its reverse (12303161), we get a palindrome (28433482).

It can be divided in two parts, 16 and 130321, that multiplied together give a 4-th power (2085136 = 38⁴).

The spelling of 16130321 in words is "sixteen million, one hundred thirty thousand, three hundred twenty-one".