21115584889 has 8 divisors (see below), whose sum is σ = 24144494400. Its totient is φ = 18089774736.

The previous prime is 21115584883. The next prime is 21115584899. The reversal of 21115584889 is 98848551112.

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 21115584889 - 2²¹ = 21113487737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21115584883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 760219 + ... + 787504.

It is an arithmetic number, because the mean of its divisors is an integer number (3018061800).

Almost surely, 2^21115584889 is an apocalyptic number.

It is an amenable number.

21115584889 is a deficient number, since it is larger than the sum of its proper divisors (3028909511).

21115584889 is a wasteful number, since it uses less digits than its factorization.

21115584889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1549679.

The product of its digits is 921600, while the sum is 52.

The spelling of 21115584889 in words is "twenty-one billion, one hundred fifteen million, five hundred eighty-four thousand, eight hundred eighty-nine".