16130821 has 4 divisors (see below), whose sum is σ = 18435232. Its totient is φ = 13826412.

The previous prime is 16130783. The next prime is 16130831. The reversal of 16130821 is 12803161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16130821 - 2¹³ = 16122629 is a prime.

It is a super-2 number, since 2×16130821² = 520406772268082, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16130792 and 16130801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16130831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1152195 + ... + 1152208.

It is an arithmetic number, because the mean of its divisors is an integer number (4608808).

Almost surely, 2^16130821 is an apocalyptic number.

It is an amenable number.

16130821 is a deficient number, since it is larger than the sum of its proper divisors (2304411).

16130821 is an equidigital number, since it uses as much as digits as its factorization.

16130821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2304410.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 16130821 is about 4016.3193349135. The cubic root of 16130821 is about 252.6691139093.

Adding to 16130821 its reverse (12803161), we get a palindrome (28933982).

The spelling of 16130821 in words is "sixteen million, one hundred thirty thousand, eight hundred twenty-one".