16043021 has 4 divisors (see below), whose sum is σ = 16169472. Its totient is φ = 15916572.

The previous prime is 16042981. The next prime is 16043023. The reversal of 16043021 is 12034061.

16043021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12034061 = 13 ⋅925697.

It is a cyclic number.

It is not a de Polignac number, because 16043021 - 2¹⁰ = 16041997 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 (16043023) 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, 63035 + ... + 63288.

It is an arithmetic number, because the mean of its divisors is an integer number (4042368).

Almost surely, 2^16043021 is an apocalyptic number.

It is an amenable number.

16043021 is a deficient number, since it is larger than the sum of its proper divisors (126451).

16043021 is a wasteful number, since it uses less digits than its factorization.

16043021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126450.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 16043021 is about 4005.3740149954. The cubic root of 16043021 is about 252.2098539594.

Adding to 16043021 its reverse (12034061), we get a palindrome (28077082).

The spelling of 16043021 in words is "sixteen million, forty-three thousand, twenty-one".