16821485 has 4 divisors (see below), whose sum is σ = 20185788. Its totient is φ = 13457184.

The previous prime is 16821481. The next prime is 16821491. The reversal of 16821485 is 58412861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58412861 = 13 ⋅4493297.

It can be written as a sum of positive squares in 2 ways, for example, as 3087049 + 13734436 = 1757^2 + 3706^2 .

It is a cyclic number.

It is not a de Polignac number, because 16821485 - 2² = 16821481 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16821481) 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, 1682144 + ... + 1682153.

It is an arithmetic number, because the mean of its divisors is an integer number (5046447).

Almost surely, 2^16821485 is an apocalyptic number.

It is an amenable number.

16821485 is a deficient number, since it is larger than the sum of its proper divisors (3364303).

16821485 is an equidigital number, since it uses as much as digits as its factorization.

16821485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3364302.

The product of its digits is 15360, while the sum is 35.

The square root of 16821485 is about 4101.4003706051. The cubic root of 16821485 is about 256.2249660256.

The spelling of 16821485 in words is "sixteen million, eight hundred twenty-one thousand, four hundred eighty-five".