21680760369 has 8 divisors (see below), whose sum is σ = 30429137440. Its totient is φ = 13693111776.

The previous prime is 21680760349. The next prime is 21680760371. The reversal of 21680760369 is 96306708612.

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

It is not a de Polignac number, because 21680760369 - 2⁸ = 21680760113 is a prime.

It is a super-2 number, since 2×21680760369² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21680760349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190182052 + ... + 190182165.

It is an arithmetic number, because the mean of its divisors is an integer number (3803642180).

Almost surely, 2^21680760369 is an apocalyptic number.

It is an amenable number.

21680760369 is a deficient number, since it is larger than the sum of its proper divisors (8748377071).

21680760369 is a wasteful number, since it uses less digits than its factorization.

21680760369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380364239.

The product of its (nonzero) digits is 653184, while the sum is 48.

The spelling of 21680760369 in words is "twenty-one billion, six hundred eighty million, seven hundred sixty thousand, three hundred sixty-nine".