23121532500 has 480 divisors, whose sum is σ = 77087324160. Its totient is φ = 5343360000.

The previous prime is 23121532481. The next prime is 23121532531. The reversal of 23121532500 is 523512132.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 259792456 + ... + 259792544.

It is an arithmetic number, because the mean of its divisors is an integer number (160598592).

Almost surely, 2^23121532500 is an apocalyptic number.

23121532500 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 23121532500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38543662080).

23121532500 is an abundant number, since it is smaller than the sum of its proper divisors (53965791660).

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

23121532500 is a wasteful number, since it uses less digits than its factorization.

23121532500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241 (or 224 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The spelling of 23121532500 in words is "twenty-three billion, one hundred twenty-one million, five hundred thirty-two thousand, five hundred".