21218112150 has 96 divisors (see below), whose sum is σ = 53458507008. Its totient is φ = 5568393600.

The previous prime is 21218112143. The next prime is 21218112187. The reversal of 21218112150 is 5121181212.

21218112150 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 21218112150.

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 47 ways as a sum of consecutive naturals, for example, 7272492 + ... + 7275408.

It is an arithmetic number, because the mean of its divisors is an integer number (556859448).

Almost surely, 2^21218112150 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21218112150, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26729253504).

21218112150 is an abundant number, since it is smaller than the sum of its proper divisors (32240394858).

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

21218112150 is a wasteful number, since it uses less digits than its factorization.

21218112150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3686 (or 3681 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 24.

Adding to 21218112150 its reverse (5121181212), we get a palindrome (26339293362).

The spelling of 21218112150 in words is "twenty-one billion, two hundred eighteen million, one hundred twelve thousand, one hundred fifty".