21384638885 has 8 divisors (see below), whose sum is σ = 25752245280. Its totient is φ = 17047258704.

The previous prime is 21384638839. The next prime is 21384638927. The reversal of 21384638885 is 58883648312.

It is a happy number.

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 21384638885 - 2¹⁰ = 21384637861 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21384638885.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7554995 + ... + 7557824.

It is an arithmetic number, because the mean of its divisors is an integer number (3219030660).

Almost surely, 2^21384638885 is an apocalyptic number.

It is an amenable number.

21384638885 is a deficient number, since it is larger than the sum of its proper divisors (4367606395).

21384638885 is a wasteful number, since it uses less digits than its factorization.

21384638885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15113107.

The product of its digits is 8847360, while the sum is 56.

The spelling of 21384638885 in words is "twenty-one billion, three hundred eighty-four million, six hundred thirty-eight thousand, eight hundred eighty-five".