21704185650880 has 56 divisors (see below), whose sum is σ = 51684056206992. Its totient is φ = 8681512307712.

The previous prime is 21704185650839. The next prime is 21704185650913. The reversal of 21704185650880 is 8805658140712.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17345179 + ... + 18554341.

Almost surely, 2^{21704185650880} is an apocalyptic number.

21704185650880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21704185650880 is an abundant number, since it is smaller than the sum of its proper divisors (29979870556112).

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

21704185650880 is a wasteful number, since it uses less digits than its factorization.

21704185650880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1265273 (or 1265263 counting only the distinct ones).

The product of its (nonzero) digits is 4300800, while the sum is 55.

The spelling of 21704185650880 in words is "twenty-one trillion, seven hundred four billion, one hundred eighty-five million, six hundred fifty thousand, eight hundred eighty".