16708121 has 4 divisors (see below), whose sum is σ = 16716672. Its totient is φ = 16699572.

The previous prime is 16708117. The next prime is 16708129. The reversal of 16708121 is 12180761.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12180761 = 467 ⋅26083.

It is a cyclic number.

It is not a de Polignac number, because 16708121 - 2² = 16708117 is a prime.

It is a super-2 number, since 2×16708121² = 558322614701282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16708129) 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, 260 + ... + 5786.

It is an arithmetic number, because the mean of its divisors is an integer number (4179168).

Almost surely, 2^16708121 is an apocalyptic number.

It is an amenable number.

16708121 is a deficient number, since it is larger than the sum of its proper divisors (8551).

16708121 is an equidigital number, since it uses as much as digits as its factorization.

16708121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8550.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 16708121 is about 4087.5568497576. The cubic root of 16708121 is about 255.6480811013.

Adding to 16708121 its reverse (12180761), we get a palindrome (28888882).

The spelling of 16708121 in words is "sixteen million, seven hundred eight thousand, one hundred twenty-one".