21365564460205 has 16 divisors (see below), whose sum is σ = 29303669625984. Its totient is φ = 14649510732480.

The previous prime is 21365564460193. The next prime is 21365564460241. The reversal of 21365564460205 is 50206446556312.

It is not a de Polignac number, because 21365564460205 - 2⁵ = 21365564460173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23761482 + ... + 24644251.

It is an arithmetic number, because the mean of its divisors is an integer number (1831479351624).

Almost surely, 2^{21365564460205} is an apocalyptic number.

It is an amenable number.

21365564460205 is a deficient number, since it is larger than the sum of its proper divisors (7938105165779).

21365564460205 is a wasteful number, since it uses less digits than its factorization.

21365564460205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48418356.

The product of its (nonzero) digits is 5184000, while the sum is 49.

The spelling of 21365564460205 in words is "twenty-one trillion, three hundred sixty-five billion, five hundred sixty-four million, four hundred sixty thousand, two hundred five".