21486563668671 has 32 divisors (see below), whose sum is σ = 29957304576000. Its totient is φ = 13672728029664.

The previous prime is 21486563668663. The next prime is 21486563668723. The reversal of 21486563668671 is 17686636568412.

It is not a de Polignac number, because 21486563668671 - 2³ = 21486563668663 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a junction number, because it is equal to n+sod(n) for n = 21486563668596 and 21486563668605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21486563668601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 418758600 + ... + 418809906.

It is an arithmetic number, because the mean of its divisors is an integer number (936165768000).

Almost surely, 2^{21486563668671} is an apocalyptic number.

21486563668671 is a deficient number, since it is larger than the sum of its proper divisors (8470740907329).

21486563668671 is a wasteful number, since it uses less digits than its factorization.

21486563668671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63995.

The product of its digits is 418037760, while the sum is 69.

The spelling of 21486563668671 in words is "twenty-one trillion, four hundred eighty-six billion, five hundred sixty-three million, six hundred sixty-eight thousand, six hundred seventy-one".