21580716458 has 48 divisors (see below), whose sum is σ = 39997831104. Its totient is φ = 8548303680.

The previous prime is 21580716407. The next prime is 21580716481. The reversal of 21580716458 is 85461708512.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 155141 + ... + 259287.

It is an arithmetic number, because the mean of its divisors is an integer number (833288148).

Almost surely, 2^21580716458 is an apocalyptic number.

21580716458 is a deficient number, since it is larger than the sum of its proper divisors (18417114646).

21580716458 is a wasteful number, since it uses less digits than its factorization.

21580716458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104235 (or 104216 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 47.

The spelling of 21580716458 in words is "twenty-one billion, five hundred eighty million, seven hundred sixteen thousand, four hundred fifty-eight".