21881935865 has 8 divisors (see below), whose sum is σ = 27640340160. Its totient is φ = 16584203952.

The previous prime is 21881935843. The next prime is 21881935939. The reversal of 21881935865 is 56853918812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21881935865 - 2⁸ = 21881935609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21881935865.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115167989 + ... + 115168178.

It is an arithmetic number, because the mean of its divisors is an integer number (3455042520).

Almost surely, 2^21881935865 is an apocalyptic number.

It is an amenable number.

21881935865 is a deficient number, since it is larger than the sum of its proper divisors (5758404295).

21881935865 is a wasteful number, since it uses less digits than its factorization.

21881935865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230336191.

The product of its digits is 4147200, while the sum is 56.

The spelling of 21881935865 in words is "twenty-one billion, eight hundred eighty-one million, nine hundred thirty-five thousand, eight hundred sixty-five".