16534021 has 12 divisors (see below), whose sum is σ = 19321632. Its totient is φ = 14107128.

The previous prime is 16534019. The next prime is 16534043. The reversal of 16534021 is 12043561.

It is not a de Polignac number, because 16534021 - 2¹ = 16534019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16533983 and 16534001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16534061) 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 11 ways as a sum of consecutive naturals, for example, 12246 + ... + 13528.

It is an arithmetic number, because the mean of its divisors is an integer number (1610136).

Almost surely, 2^16534021 is an apocalyptic number.

It is an amenable number.

16534021 is a deficient number, since it is larger than the sum of its proper divisors (2787611).

16534021 is a wasteful number, since it uses less digits than its factorization.

16534021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560 (or 1553 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 16534021 is about 4066.2047415250. The cubic root of 16534021 is about 254.7570208875.

Adding to 16534021 its reverse (12043561), we get a palindrome (28577582).

The spelling of 16534021 in words is "sixteen million, five hundred thirty-four thousand, twenty-one".