16103821 has 4 divisors (see below), whose sum is σ = 16254432. Its totient is φ = 15953212.

The previous prime is 16103819. The next prime is 16103827. The reversal of 16103821 is 12830161.

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 16103821 - 2¹ = 16103819 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16103792 and 16103801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16103827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75145 + ... + 75358.

It is an arithmetic number, because the mean of its divisors is an integer number (4063608).

Almost surely, 2^16103821 is an apocalyptic number.

It is an amenable number.

16103821 is a deficient number, since it is larger than the sum of its proper divisors (150611).

16103821 is a wasteful number, since it uses less digits than its factorization.

16103821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150610.

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

The square root of 16103821 is about 4012.9566406828. The cubic root of 16103821 is about 252.5280614501.

Adding to 16103821 its reverse (12830161), we get a palindrome (28933982).

The spelling of 16103821 in words is "sixteen million, one hundred three thousand, eight hundred twenty-one".