12216781344 has 48 divisors (see below), whose sum is σ = 32594788800. Its totient is φ = 4005500160.

The previous prime is 12216781321. The next prime is 12216781403. The reversal of 12216781344 is 44318761221.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1037244 + ... + 1048955.

It is an arithmetic number, because the mean of its divisors is an integer number (679058100).

Almost surely, 2^12216781344 is an apocalyptic number.

It is an amenable number.

12216781344 is an abundant number, since it is smaller than the sum of its proper divisors (20378007456).

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

12216781344 is a wasteful number, since it uses less digits than its factorization.

12216781344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2086273 (or 2086265 counting only the distinct ones).

The product of its digits is 64512, while the sum is 39.

The spelling of 12216781344 in words is "twelve billion, two hundred sixteen million, seven hundred eighty-one thousand, three hundred forty-four".