21236685189 has 8 divisors (see below), whose sum is σ = 28457870400. Its totient is φ = 14086645056.

The previous prime is 21236685161. The next prime is 21236685229. The reversal of 21236685189 is 98158663212.

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

It is not a de Polignac number, because 21236685189 - 2¹⁷ = 21236554117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21236687189) 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, 17785572 + ... + 17786765.

It is an arithmetic number, because the mean of its divisors is an integer number (3557233800).

Almost surely, 2^21236685189 is an apocalyptic number.

It is an amenable number.

21236685189 is a deficient number, since it is larger than the sum of its proper divisors (7221185211).

21236685189 is a wasteful number, since it uses less digits than its factorization.

21236685189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35572539.

The product of its digits is 1244160, while the sum is 51.

The spelling of 21236685189 in words is "twenty-one billion, two hundred thirty-six million, six hundred eighty-five thousand, one hundred eighty-nine".