21580490305 has 8 divisors (see below), whose sum is σ = 28250823744. Its totient is φ = 15694902000.

The previous prime is 21580490297. The next prime is 21580490369. The reversal of 21580490305 is 50309408512.

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

It is not a de Polignac number, because 21580490305 - 2³ = 21580490297 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196186221 + ... + 196186330.

It is an arithmetic number, because the mean of its divisors is an integer number (3531352968).

Almost surely, 2^21580490305 is an apocalyptic number.

It is an amenable number.

21580490305 is a deficient number, since it is larger than the sum of its proper divisors (6670333439).

21580490305 is a wasteful number, since it uses less digits than its factorization.

21580490305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392372567.

The product of its (nonzero) digits is 43200, while the sum is 37.

Adding to 21580490305 its reverse (50309408512), we get a palindrome (71889898817).

The spelling of 21580490305 in words is "twenty-one billion, five hundred eighty million, four hundred ninety thousand, three hundred five".