12182177740021 has 2 divisors, whose sum is σ = 12182177740022. Its totient is φ = 12182177740020.

The previous prime is 12182177739971. The next prime is 12182177740091. The reversal of 12182177740021 is 12004777128121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11370647017521 + 811530722500 = 3372039^2 + 900850^2 .

It is an emirp because it is prime and its reverse (12004777128121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12182177740021 - 2⁹ = 12182177739509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12182177740021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12182177740091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6091088870010 + 6091088870011.

It is an arithmetic number, because the mean of its divisors is an integer number (6091088870011).

Almost surely, 2^{12182177740021} is an apocalyptic number.

It is an amenable number.

12182177740021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12182177740021 is an equidigital number, since it uses as much as digits as its factorization.

12182177740021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 87808, while the sum is 43.

The spelling of 12182177740021 in words is "twelve trillion, one hundred eighty-two billion, one hundred seventy-seven million, seven hundred forty thousand, twenty-one".