21718285676870 has 32 divisors (see below), whose sum is σ = 40002478483968. Its totient is φ = 8485193189088.

The previous prime is 21718285676869. The next prime is 21718285676891. The reversal of 21718285676870 is 7867658281712.

It is a happy number.

It is a Smith number, since the sum of its digits (68) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 21718285676870.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 51755237 + ... + 52173183.

It is an arithmetic number, because the mean of its divisors is an integer number (1250077452624).

Almost surely, 2^{21718285676870} is an apocalyptic number.

21718285676870 is a deficient number, since it is larger than the sum of its proper divisors (18284192807098).

21718285676870 is a wasteful number, since it uses less digits than its factorization.

21718285676870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538844.

The product of its (nonzero) digits is 126443520, while the sum is 68.

The spelling of 21718285676870 in words is "twenty-one trillion, seven hundred eighteen billion, two hundred eighty-five million, six hundred seventy-six thousand, eight hundred seventy".