21047849585280 has 2304 divisors, whose sum is σ = 92852821152000. Its totient is φ = 4553559908352.

The previous prime is 21047849585209. The next prime is 21047849585281. The reversal of 21047849585280 is 8258594874012.

21047849585280 is a `hidden beast` number, since 2 + 1 + 0 + 4 + 7 + 8 + 49 + 585 + 2 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (21047849585281) by changing a digit.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 19256952414 + ... + 19256953506.

It is an arithmetic number, because the mean of its divisors is an integer number (40300703625).

Almost surely, 2^{21047849585280} is an apocalyptic number.

21047849585280 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 21047849585280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46426410576000).

21047849585280 is an abundant number, since it is smaller than the sum of its proper divisors (71804971566720).

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

21047849585280 is an equidigital number, since it uses as much as digits as its factorization.

21047849585280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1186 (or 1129 counting only the distinct ones).

The product of its (nonzero) digits is 51609600, while the sum is 63.

The spelling of 21047849585280 in words is "twenty-one trillion, forty-seven billion, eight hundred forty-nine million, five hundred eighty-five thousand, two hundred eighty".