21486765081 has 32 divisors (see below), whose sum is σ = 29881353600. Its totient is φ = 13721630720.

The previous prime is 21486765059. The next prime is 21486765101. The reversal of 21486765081 is 18056768412.

It is not a de Polignac number, because 21486765081 - 2¹¹ = 21486763033 is a prime.

It is a super-2 number, since 2×21486765081² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21486765081.

It is not an unprimeable number, because it can be changed into a prime (21486760081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9353125 + ... + 9355421.

It is an arithmetic number, because the mean of its divisors is an integer number (933792300).

Almost surely, 2^21486765081 is an apocalyptic number.

It is an amenable number.

21486765081 is a deficient number, since it is larger than the sum of its proper divisors (8394588519).

21486765081 is a wasteful number, since it uses less digits than its factorization.

21486765081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3689.

The product of its (nonzero) digits is 645120, while the sum is 48.

The spelling of 21486765081 in words is "twenty-one billion, four hundred eighty-six million, seven hundred sixty-five thousand, eighty-one".