12216975287841 has 27 divisors (see below), whose sum is σ = 18137147283801. Its totient is φ = 7924272850944.

The previous prime is 12216975287819. The next prime is 12216975287879. The reversal of 12216975287841 is 14878257961221.

The square root of 12216975287841 is 3495279.

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

12216975287841 is a `hidden beast` number, since 1 + 2 + 2 + 1 + 69 + 7 + 528 + 7 + 8 + 41 = 666.

12216975287841 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3344893499025 + 8872081788816 = 1828905^2 + 2978604^2 .

It is not a de Polignac number, because 12216975287841 - 2⁵ = 12216975287809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12216975287641) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 387960225 + ... + 387991713.

Almost surely, 2^{12216975287841} is an apocalyptic number.

12216975287841 is the 3495279-th square number.

12216975287841 is the 1747640-th centered octagonal number.

It is an amenable number.

12216975287841 is a deficient number, since it is larger than the sum of its proper divisors (5920171995960).

12216975287841 is an frugal number, since it uses more digits than its factorization.

12216975287841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63058 (or 31529 counting only the distinct ones).

The product of its digits is 27095040, while the sum is 63.

The spelling of 12216975287841 in words is "twelve trillion, two hundred sixteen billion, nine hundred seventy-five million, two hundred eighty-seven thousand, eight hundred forty-one".