21732653824 has 144 divisors (see below), whose sum is σ = 51448461120. Its totient is φ = 8964587520.

The previous prime is 21732653809. The next prime is 21732653827. The reversal of 21732653824 is 42835623712.

It is not an unprimeable number, because it can be changed into a prime (21732653827) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28114302 + ... + 28115074.

It is an arithmetic number, because the mean of its divisors is an integer number (357280980).

Almost surely, 2^21732653824 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 21732653824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25724230560).

21732653824 is an abundant number, since it is smaller than the sum of its proper divisors (29715807296).

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

21732653824 is an equidigital number, since it uses as much as digits as its factorization.

21732653824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1366 (or 1352 counting only the distinct ones).

The product of its digits is 483840, while the sum is 43.

The spelling of 21732653824 in words is "twenty-one billion, seven hundred thirty-two million, six hundred fifty-three thousand, eight hundred twenty-four".