21500521530224 has 80 divisors (see below), whose sum is σ = 45583964805600. Its totient is φ = 9742931681280.

The previous prime is 21500521530197. The next prime is 21500521530233. The reversal of 21500521530224 is 42203512500512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 987474602 + ... + 987496374.

It is an arithmetic number, because the mean of its divisors is an integer number (569799560070).

Almost surely, 2^{21500521530224} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21500521530224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22791982402800).

21500521530224 is an abundant number, since it is smaller than the sum of its proper divisors (24083443275376).

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

21500521530224 is a wasteful number, since it uses less digits than its factorization.

21500521530224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38778 (or 38772 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 32.

The spelling of 21500521530224 in words is "twenty-one trillion, five hundred billion, five hundred twenty-one million, five hundred thirty thousand, two hundred twenty-four".