16030921 has 4 divisors (see below), whose sum is σ = 16082452. Its totient is φ = 15979392.

The previous prime is 16030919. The next prime is 16030933. The reversal of 16030921 is 12903061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12903061 = 67 ⋅192583.

It can be written as a sum of positive squares in 2 ways, for example, as 1863225 + 14167696 = 1365^2 + 3764^2 .

It is a cyclic number.

It is not a de Polignac number, because 16030921 - 2¹ = 16030919 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16030892 and 16030901.

It is not an unprimeable number, because it can be changed into a prime (16030951) 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 3 ways as a sum of consecutive naturals, for example, 25296 + ... + 25921.

It is an arithmetic number, because the mean of its divisors is an integer number (4020613).

Almost surely, 2^16030921 is an apocalyptic number.

It is an amenable number.

16030921 is a deficient number, since it is larger than the sum of its proper divisors (51531).

16030921 is an equidigital number, since it uses as much as digits as its factorization.

16030921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51530.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 16030921 is about 4003.8632594033. The cubic root of 16030921 is about 252.1464306016.

Adding to 16030921 its reverse (12903061), we get a palindrome (28933982).

The spelling of 16030921 in words is "sixteen million, thirty thousand, nine hundred twenty-one".