12065600656021 has 6 divisors (see below), whose sum is σ = 13262189150966. Its totient is φ = 10968727869000.

The previous prime is 12065600656009. The next prime is 12065600656069.

12065600656021 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 11878955055396 + 186645600625 = 3446586^2 + 432025^2 .

It is not a de Polignac number, because 12065600656021 - 2¹⁵ = 12065600623253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12065600656321) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 49857853830 + ... + 49857854071.

Almost surely, 2^{12065600656021} is an apocalyptic number.

12065600656021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12065600656021 is a deficient number, since it is larger than the sum of its proper divisors (1196588494945).

12065600656021 is an equidigital number, since it uses as much as digits as its factorization.

12065600656021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99715707923 (or 99715707912 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 40.

The spelling of 12065600656021 in words is "twelve trillion, sixty-five billion, six hundred million, six hundred fifty-six thousand, twenty-one".