21579851250 has 160 divisors (see below), whose sum is σ = 60097762560. Its totient is φ = 5738040000.

The previous prime is 21579851213. The next prime is 21579851261. The reversal of 21579851250 is 5215897512.

21579851250 is a `hidden beast` number, since 2 + 1 + 579 + 8 + 51 + 25 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21579851196 and 21579851205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 15625560 + ... + 15626940.

It is an arithmetic number, because the mean of its divisors is an integer number (375611016).

Almost surely, 2^21579851250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21579851250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30048881280).

21579851250 is an abundant number, since it is smaller than the sum of its proper divisors (38517911310).

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

21579851250 is a wasteful number, since it uses less digits than its factorization.

21579851250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1875 (or 1854 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 45.

The spelling of 21579851250 in words is "twenty-one billion, five hundred seventy-nine million, eight hundred fifty-one thousand, two hundred fifty".