21666035055224 has 16 divisors (see below), whose sum is σ = 46427217975600. Its totient is φ = 9285443595072.

The previous prime is 21666035055209. The next prime is 21666035055271. The reversal of 21666035055224 is 42255053066612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193446741509 + ... + 193446741620.

It is an arithmetic number, because the mean of its divisors is an integer number (2901701123475).

Almost surely, 2^{21666035055224} is an apocalyptic number.

It is an amenable number.

21666035055224 is an abundant number, since it is smaller than the sum of its proper divisors (24761182920376).

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

21666035055224 is a wasteful number, since it uses less digits than its factorization.

21666035055224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386893483142 (or 386893483138 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 47.

The spelling of 21666035055224 in words is "twenty-one trillion, six hundred sixty-six billion, thirty-five million, fifty-five thousand, two hundred twenty-four".