21582680481660 has 48 divisors (see below), whose sum is σ = 60457860511776. Its totient is φ = 5752871446272.

The previous prime is 21582680481653. The next prime is 21582680481671. The reversal of 21582680481660 is 6618408628512.

It is a self number, because there is not a number n which added to its sum of digits gives 21582680481660.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78299259 + ... + 78574418.

It is an arithmetic number, because the mean of its divisors is an integer number (1259538760662).

Almost surely, 2^{21582680481660} is an apocalyptic number.

21582680481660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21582680481660 is an abundant number, since it is smaller than the sum of its proper divisors (38875180030116).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21582680481660 is a wasteful number, since it uses less digits than its factorization.

21582680481660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156875982 (or 156875980 counting only the distinct ones).

The product of its (nonzero) digits is 8847360, while the sum is 57.

The spelling of 21582680481660 in words is "twenty-one trillion, five hundred eighty-two billion, six hundred eighty million, four hundred eighty-one thousand, six hundred sixty".