21724873284 has 96 divisors (see below), whose sum is σ = 55294525440. Its totient is φ = 6618268800.

The previous prime is 21724873267. The next prime is 21724873349. The reversal of 21724873284 is 48237842712.

It is a happy 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, 659854 + ... + 691994.

It is an arithmetic number, because the mean of its divisors is an integer number (575984640).

Almost surely, 2^21724873284 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 21724873284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27647262720).

21724873284 is an abundant number, since it is smaller than the sum of its proper divisors (33569652156).

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

21724873284 is a wasteful number, since it uses less digits than its factorization.

21724873284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32281 (or 32279 counting only the distinct ones).

The product of its digits is 1204224, while the sum is 48.

The spelling of 21724873284 in words is "twenty-one billion, seven hundred twenty-four million, eight hundred seventy-three thousand, two hundred eighty-four".