16768821 has 8 divisors (see below), whose sum is σ = 22519840. Its totient is φ = 11098512.

The previous prime is 16768819. The next prime is 16768823. The reversal of 16768821 is 12886761.

It is an interprime number because it is at equal distance from previous prime (16768819) and next prime (16768823).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16768821 - 2¹ = 16768819 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16768821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16768823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19690 + ... + 20523.

It is an arithmetic number, because the mean of its divisors is an integer number (2814980).

Almost surely, 2^16768821 is an apocalyptic number.

It is an amenable number.

16768821 is a deficient number, since it is larger than the sum of its proper divisors (5751019).

16768821 is a wasteful number, since it uses less digits than its factorization.

16768821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40355.

The product of its digits is 32256, while the sum is 39.

The square root of 16768821 is about 4094.9750914993. The cubic root of 16768821 is about 255.9572936980.

The spelling of 16768821 in words is "sixteen million, seven hundred sixty-eight thousand, eight hundred twenty-one".