21888673809 has 8 divisors (see below), whose sum is σ = 29298459360. Its totient is φ = 14535668736.

The previous prime is 21888673753. The next prime is 21888673811. The reversal of 21888673809 is 90837688812.

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

It is not a de Polignac number, because 21888673809 - 2⁹ = 21888673297 is a prime.

It is a super-2 number, since 2×21888673809² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21888673889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14194219 + ... + 14195760.

It is an arithmetic number, because the mean of its divisors is an integer number (3662307420).

Almost surely, 2^21888673809 is an apocalyptic number.

It is an amenable number.

21888673809 is a deficient number, since it is larger than the sum of its proper divisors (7409785551).

21888673809 is a wasteful number, since it uses less digits than its factorization.

21888673809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28390239.

The product of its (nonzero) digits is 9289728, while the sum is 60.

The spelling of 21888673809 in words is "twenty-one billion, eight hundred eighty-eight million, six hundred seventy-three thousand, eight hundred nine".