21210307866224 has 80 divisors (see below), whose sum is σ = 42426243921600. Its totient is φ = 10264611796992.

The previous prime is 21210307866197. The next prime is 21210307866283. The reversal of 21210307866224 is 42266870301212.

It is a Cunningham number, because it is equal to 4605465²-1.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1363210157 + ... + 1363225715.

It is an arithmetic number, because the mean of its divisors is an integer number (530328049020).

Almost surely, 2^{21210307866224} is an apocalyptic number.

It is an amenable number.

21210307866224 is an abundant number, since it is smaller than the sum of its proper divisors (21215936055376).

21210307866224 is a wasteful number, since it uses less digits than its factorization.

21210307866224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27490 (or 27484 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 44.

The spelling of 21210307866224 in words is "twenty-one trillion, two hundred ten billion, three hundred seven million, eight hundred sixty-six thousand, two hundred twenty-four".