21906566472384 has 168 divisors, whose sum is σ = 70788150026160. Its totient is φ = 6638353413120.

The previous prime is 21906566472361. The next prime is 21906566472419. The reversal of 21906566472384 is 48327466560912.

21906566472384 is a `hidden beast` number, since 2 + 1 + 9 + 0 + 6 + 566 + 47 + 23 + 8 + 4 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 52176909 + ... + 52595084.

It is an arithmetic number, because the mean of its divisors is an integer number (421358035870).

It is a 1-persistent number, because it is pandigital, but 2⋅21906566472384 = 43813132944768 is not.

Almost surely, 2^{21906566472384} is an apocalyptic number.

21906566472384 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21906566472384 is an abundant number, since it is smaller than the sum of its proper divisors (48881583553776).

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

21906566472384 is a wasteful number, since it uses less digits than its factorization.

21906566472384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104772036 (or 104772009 counting only the distinct ones).

The product of its (nonzero) digits is 104509440, while the sum is 63.

The spelling of 21906566472384 in words is "twenty-one trillion, nine hundred six billion, five hundred sixty-six million, four hundred seventy-two thousand, three hundred eighty-four".