21784129472484 has 48 divisors (see below), whose sum is σ = 56711718719040. Its totient is φ = 7231246289280.

The previous prime is 21784129472473. The next prime is 21784129472503. The reversal of 21784129472484 is 48427492148712.

21784129472484 is a `hidden beast` number, since 2 + 1 + 7 + 84 + 1 + 2 + 9 + 4 + 72 + 484 = 666.

It is a super-2 number, since 2×21784129472484² (a number of 27 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 418448874 + ... + 418500929.

It is an arithmetic number, because the mean of its divisors is an integer number (1181494139980).

Almost surely, 2^{21784129472484} is an apocalyptic number.

It is an amenable number.

21784129472484 is an abundant number, since it is smaller than the sum of its proper divisors (34927589246556).

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

21784129472484 is a wasteful number, since it uses less digits than its factorization.

21784129472484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 836950057 (or 836950049 counting only the distinct ones).

The product of its digits is 57802752, while the sum is 63.

The spelling of 21784129472484 in words is "twenty-one trillion, seven hundred eighty-four billion, one hundred twenty-nine million, four hundred seventy-two thousand, four hundred eighty-four".