16144821 has 24 divisors (see below), whose sum is σ = 29075904. Its totient is φ = 8386560.

The previous prime is 16144811. The next prime is 16144837. The reversal of 16144821 is 12844161.

It is a happy number.

16144821 is a `hidden beast` number, since 1 + 614 + 48 + 2 + 1 = 666.

It is not a de Polignac number, because 16144821 - 2¹⁰ = 16143797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16144811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10956 + ... + 12341.

It is an arithmetic number, because the mean of its divisors is an integer number (1211496).

Almost surely, 2^16144821 is an apocalyptic number.

16144821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16144821 is a deficient number, since it is larger than the sum of its proper divisors (12931083).

16144821 is a wasteful number, since it uses less digits than its factorization.

16144821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23321 (or 23318 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 16144821 is about 4018.0618462139. The cubic root of 16144821 is about 252.7421902626.

Adding to 16144821 its reverse (12844161), we get a palindrome (28988982).

The spelling of 16144821 in words is "sixteen million, one hundred forty-four thousand, eight hundred twenty-one".