21847078512 has 160 divisors (see below), whose sum is σ = 72150144000. Its totient is φ = 6200001792.

The previous prime is 21847078507. The next prime is 21847078531. The reversal of 21847078512 is 21587074812.

21847078512 is a `hidden beast` number, since 21 + 8 + 47 + 0 + 78 + 512 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 426333 + ... + 474819.

It is an arithmetic number, because the mean of its divisors is an integer number (450938400).

Almost surely, 2^21847078512 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 21847078512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36075072000).

21847078512 is an abundant number, since it is smaller than the sum of its proper divisors (50303065488).

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

21847078512 is a wasteful number, since it uses less digits than its factorization.

21847078512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48660 (or 48648 counting only the distinct ones).

The product of its (nonzero) digits is 250880, while the sum is 45.

The spelling of 21847078512 in words is "twenty-one billion, eight hundred forty-seven million, seventy-eight thousand, five hundred twelve".