21324502500 has 240 divisors, whose sum is σ = 75242014848. Its totient is φ = 4587264000.

The previous prime is 21324502489. The next prime is 21324502501. The reversal of 21324502500 is 520542312.

It is not an unprimeable number, because it can be changed into a prime (21324502501) by changing a digit.

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 79 ways as a sum of consecutive naturals, for example, 880554 + ... + 904446.

Almost surely, 2^21324502500 is an apocalyptic number.

21324502500 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 21324502500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37621007424).

21324502500 is an abundant number, since it is smaller than the sum of its proper divisors (53917512348).

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

21324502500 is a wasteful number, since it uses less digits than its factorization.

21324502500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23944 (or 23927 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The spelling of 21324502500 in words is "twenty-one billion, three hundred twenty-four million, five hundred two thousand, five hundred".