21184814712 has 128 divisors (see below), whose sum is σ = 56674598400. Its totient is φ = 6579417600.

The previous prime is 21184814701. The next prime is 21184814747. The reversal of 21184814712 is 21741848112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25803262 + ... + 25804082.

It is an arithmetic number, because the mean of its divisors is an integer number (442770300).

Almost surely, 2^21184814712 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21184814712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28337299200).

21184814712 is an abundant number, since it is smaller than the sum of its proper divisors (35489783688).

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

21184814712 is a wasteful number, since it uses less digits than its factorization.

21184814712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1717 (or 1713 counting only the distinct ones).

The product of its digits is 28672, while the sum is 39.

The spelling of 21184814712 in words is "twenty-one billion, one hundred eighty-four million, eight hundred fourteen thousand, seven hundred twelve".