21152324240 has 80 divisors (see below), whose sum is σ = 51377711616. Its totient is φ = 8089267200.

The previous prime is 21152324183. The next prime is 21152324251. The reversal of 21152324240 is 4242325112.

It is a tau number, because it is divible by the number of its divisors (80).

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 15 ways as a sum of consecutive naturals, for example, 154460 + ... + 257220.

Almost surely, 2^21152324240 is an apocalyptic number.

21152324240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21152324240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25688855808).

21152324240 is an abundant number, since it is smaller than the sum of its proper divisors (30225387376).

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

21152324240 is a wasteful number, since it uses less digits than its factorization.

21152324240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102888 (or 102882 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 21152324240 its reverse (4242325112), we get a palindrome (25394649352).

The spelling of 21152324240 in words is "twenty-one billion, one hundred fifty-two million, three hundred twenty-four thousand, two hundred forty".