21866113182 has 8 divisors (see below), whose sum is σ = 43732226376. Its totient is φ = 7288704392.

The previous prime is 21866113163. The next prime is 21866113193. The reversal of 21866113182 is 28131166812.

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

21866113182 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 21866113182.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1822176093 + ... + 1822176104.

It is an arithmetic number, because the mean of its divisors is an integer number (5466528297).

Almost surely, 2^21866113182 is an apocalyptic number.

21866113182 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21866113182 is a wasteful number, since it uses less digits than its factorization.

21866113182 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3644352202.

The product of its digits is 27648, while the sum is 39.

Adding to 21866113182 its reverse (28131166812), we get a palindrome (49997279994).

The spelling of 21866113182 in words is "twenty-one billion, eight hundred sixty-six million, one hundred thirteen thousand, one hundred eighty-two".