21580676499 has 8 divisors (see below), whose sum is σ = 29551917520. Its totient is φ = 13998276576.

The previous prime is 21580676489. The next prime is 21580676519. The reversal of 21580676499 is 99467608512.

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

It is not a de Polignac number, because 21580676499 - 2¹² = 21580672403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21580676449) 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, 97210144 + ... + 97210365.

It is an arithmetic number, because the mean of its divisors is an integer number (3693989690).

Almost surely, 2^21580676499 is an apocalyptic number.

21580676499 is a deficient number, since it is larger than the sum of its proper divisors (7971241021).

21580676499 is a wasteful number, since it uses less digits than its factorization.

21580676499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194420549.

The product of its (nonzero) digits is 6531840, while the sum is 57.

The spelling of 21580676499 in words is "twenty-one billion, five hundred eighty million, six hundred seventy-six thousand, four hundred ninety-nine".