21124718988750 has 480 divisors, whose sum is σ = 65650295430720. Its totient is φ = 4861555200000.

The previous prime is 21124718988749. The next prime is 21124718988757. The reversal of 21124718988750 is 5788981742112.

21124718988750 is a `hidden beast` number, since 2 + 1 + 1 + 2 + 471 + 8 + 98 + 8 + 75 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124718988757) by changing a digit.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 375395616 + ... + 375451884.

It is an arithmetic number, because the mean of its divisors is an integer number (136771448814).

Almost surely, 2^{21124718988750} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21124718988750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32825147715360).

21124718988750 is an abundant number, since it is smaller than the sum of its proper divisors (44525576441970).

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

21124718988750 is a wasteful number, since it uses less digits than its factorization.

21124718988750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56478 (or 56460 counting only the distinct ones).

The product of its (nonzero) digits is 18063360, while the sum is 63.

The spelling of 21124718988750 in words is "twenty-one trillion, one hundred twenty-four billion, seven hundred eighteen million, nine hundred eighty-eight thousand, seven hundred fifty".