21580716457 has 8 divisors (see below), whose sum is σ = 22147461440. Its totient is φ = 21020841360.

The previous prime is 21580716407. The next prime is 21580716481. The reversal of 21580716457 is 75461708512.

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

It is a cyclic number.

It is not a de Polignac number, because 21580716457 - 2⁷ = 21580716329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21580716407) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1711107 + ... + 1723672.

It is an arithmetic number, because the mean of its divisors is an integer number (2768432680).

Almost surely, 2^21580716457 is an apocalyptic number.

It is an amenable number.

21580716457 is a deficient number, since it is larger than the sum of its proper divisors (566744983).

21580716457 is a wasteful number, since it uses less digits than its factorization.

21580716457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3434943.

The product of its (nonzero) digits is 470400, while the sum is 46.

The spelling of 21580716457 in words is "twenty-one billion, five hundred eighty million, seven hundred sixteen thousand, four hundred fifty-seven".