21124868328 has 96 divisors (see below), whose sum is σ = 59763450240. Its totient is φ = 6728388480.

The previous prime is 21124868299. The next prime is 21124868333. The reversal of 21124868328 is 82386842112.

21124868328 is a `hidden beast` number, since 21 + 1 + 248 + 68 + 328 = 666.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1701150 + ... + 1713522.

It is an arithmetic number, because the mean of its divisors is an integer number (622535940).

Almost surely, 2^21124868328 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 21124868328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29881725120).

21124868328 is an abundant number, since it is smaller than the sum of its proper divisors (38638581912).

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

21124868328 is a wasteful number, since it uses less digits than its factorization.

21124868328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13439 (or 13432 counting only the distinct ones).

The product of its digits is 294912, while the sum is 45.

The spelling of 21124868328 in words is "twenty-one billion, one hundred twenty-four million, eight hundred sixty-eight thousand, three hundred twenty-eight".