16621516 has 12 divisors (see below), whose sum is σ = 29486632. Its totient is φ = 8196768.

The previous prime is 16621513. The next prime is 16621541. The reversal of 16621516 is 61512661.

16621516 is nontrivially palindromic in base 15.

It is not an unprimeable number, because it can be changed into a prime (16621511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28170 + ... + 28753.

Almost surely, 2^16621516 is an apocalyptic number.

It is an amenable number.

16621516 is a deficient number, since it is larger than the sum of its proper divisors (12865116).

16621516 is a wasteful number, since it uses less digits than its factorization.

16621516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57000 (or 56998 counting only the distinct ones).

The product of its digits is 2160, while the sum is 28.

The square root of 16621516 is about 4076.9493496976. The cubic root of 16621516 is about 255.2056063141.

The spelling of 16621516 in words is "sixteen million, six hundred twenty-one thousand, five hundred sixteen".