21318134785893 has 48 divisors (see below), whose sum is σ = 34528982080320. Its totient is φ = 12561936710400.

The previous prime is 21318134785891. The next prime is 21318134785907. The reversal of 21318134785893 is 39858743181312.

It is a happy number.

21318134785893 is a `hidden beast` number, since 2 + 1 + 3 + 1 + 8 + 1 + 3 + 47 + 8 + 589 + 3 = 666.

It is not a de Polignac number, because 21318134785893 - 2¹ = 21318134785891 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21318134785893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21318134785891) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7773283 + ... + 10151856.

It is an arithmetic number, because the mean of its divisors is an integer number (719353793340).

Almost surely, 2^{21318134785893} is an apocalyptic number.

It is an amenable number.

21318134785893 is a deficient number, since it is larger than the sum of its proper divisors (13210847294427).

21318134785893 is a wasteful number, since it uses less digits than its factorization.

21318134785893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17925490 (or 17925487 counting only the distinct ones).

The product of its digits is 34836480, while the sum is 63.

The spelling of 21318134785893 in words is "twenty-one trillion, three hundred eighteen billion, one hundred thirty-four million, seven hundred eighty-five thousand, eight hundred ninety-three".