21558082480 has 240 divisors, whose sum is σ = 58506969600. Its totient is φ = 7324162560.

The previous prime is 21558082453. The next prime is 21558082501. The reversal of 21558082480 is 8428085512.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 25096291 + ... + 25097149.

It is an arithmetic number, because the mean of its divisors is an integer number (243779040).

Almost surely, 2^21558082480 is an apocalyptic number.

21558082480 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 21558082480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29253484800).

21558082480 is an abundant number, since it is smaller than the sum of its proper divisors (36948887120).

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

21558082480 is a wasteful number, since it uses less digits than its factorization.

21558082480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000 (or 975 counting only the distinct ones).

The product of its (nonzero) digits is 204800, while the sum is 43.

The spelling of 21558082480 in words is "twenty-one billion, five hundred fifty-eight million, eighty-two thousand, four hundred eighty".