16521117 has 4 divisors (see below), whose sum is σ = 22028160. Its totient is φ = 11014076.

The previous prime is 16521103. The next prime is 16521133. The reversal of 16521117 is 71112561.

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 16521117 - 2⁴ = 16521101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16521157) 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, 2753517 + ... + 2753522.

It is an arithmetic number, because the mean of its divisors is an integer number (5507040).

Almost surely, 2^16521117 is an apocalyptic number.

It is an amenable number.

16521117 is a deficient number, since it is larger than the sum of its proper divisors (5507043).

16521117 is an equidigital number, since it uses as much as digits as its factorization.

16521117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5507042.

The product of its digits is 420, while the sum is 24.

The square root of 16521117 is about 4064.6176941995. The cubic root of 16521117 is about 254.6907284798.

Adding to 16521117 its reverse (71112561), we get a palindrome (87633678).

The spelling of 16521117 in words is "sixteen million, five hundred twenty-one thousand, one hundred seventeen".