21666224643104 has 24 divisors (see below), whose sum is σ = 42698772889920. Its totient is φ = 10822091845696.

The previous prime is 21666224643097. The next prime is 21666224643109. The reversal of 21666224643104 is 40134642266612.

It is not an unprimeable number, because it can be changed into a prime (21666224643109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 344357924 + ... + 344420835.

It is an arithmetic number, because the mean of its divisors is an integer number (1779115537080).

Almost surely, 2^{21666224643104} is an apocalyptic number.

It is an amenable number.

21666224643104 is a deficient number, since it is larger than the sum of its proper divisors (21032548246816).

21666224643104 is an equidigital number, since it uses as much as digits as its factorization.

21666224643104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688779752 (or 688779744 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 47.

The spelling of 21666224643104 in words is "twenty-one trillion, six hundred sixty-six billion, two hundred twenty-four million, six hundred forty-three thousand, one hundred four".