21566343245366 has 32 divisors (see below), whose sum is σ = 35357854371840. Its totient is φ = 9821342966400.

The previous prime is 21566343245347. The next prime is 21566343245389. The reversal of 21566343245366 is 66354234366512.

It is a happy 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, 117364901 + ... + 117548511.

It is an arithmetic number, because the mean of its divisors is an integer number (1104932949120).

Almost surely, 2^{21566343245366} is an apocalyptic number.

21566343245366 is a deficient number, since it is larger than the sum of its proper divisors (13791511126474).

21566343245366 is a wasteful number, since it uses less digits than its factorization.

21566343245366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295100.

The product of its digits is 55987200, while the sum is 56.

The spelling of 21566343245366 in words is "twenty-one trillion, five hundred sixty-six billion, three hundred forty-three million, two hundred forty-five thousand, three hundred sixty-six".