12216438784 has 117 divisors (see below), whose sum is σ = 27024820221. Its totient is φ = 5517557760.

The previous prime is 12216438757. The next prime is 12216438809. The reversal of 12216438784 is 48783461221.

The square root of 12216438784 is 110528.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 3580825600 + 8635613184 = 59840^2 + 92928^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 77811634 + ... + 77811790.

Almost surely, 2^12216438784 is an apocalyptic number.

12216438784 is the 110528-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12216438784

12216438784 is an abundant number, since it is smaller than the sum of its proper divisors (14808381437).

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

12216438784 is an frugal number, since it uses more digits than its factorization.

12216438784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360 (or 170 counting only the distinct ones).

The product of its digits is 516096, while the sum is 46.

The spelling of 12216438784 in words is "twelve billion, two hundred sixteen million, four hundred thirty-eight thousand, seven hundred eighty-four".