16160821 has 2 divisors, whose sum is σ = 16160822. Its totient is φ = 16160820.

The previous prime is 16160783. The next prime is 16160839. The reversal of 16160821 is 12806161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15295921 + 864900 = 3911^2 + 930^2 .

It is an emirp because it is prime and its reverse (12806161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16160821 - 2¹¹ = 16158773 is a prime.

It is a super-2 number, since 2×16160821² = 522344270788082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16160861) 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 as a sum of consecutive naturals, namely, 8080410 + 8080411.

It is an arithmetic number, because the mean of its divisors is an integer number (8080411).

Almost surely, 2^16160821 is an apocalyptic number.

It is an amenable number.

16160821 is a deficient number, since it is larger than the sum of its proper divisors (1).

16160821 is an equidigital number, since it uses as much as digits as its factorization.

16160821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 16160821 is about 4020.0523628431. The cubic root of 16160821 is about 252.8256543842.

Adding to 16160821 its reverse (12806161), we get a palindrome (28966982).

The spelling of 16160821 in words is "sixteen million, one hundred sixty thousand, eight hundred twenty-one".