12421144302181 has 2 divisors, whose sum is σ = 12421144302182. Its totient is φ = 12421144302180.

The previous prime is 12421144302173. The next prime is 12421144302227. The reversal of 12421144302181 is 18120344112421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12217359771556 + 203784530625 = 3495334^2 + 451425^2 .

It is a cyclic number.

It is not a de Polignac number, because 12421144302181 - 2³ = 12421144302173 is a prime.

It is a super-2 number, since 2×12421144302181² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12421144302101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6210572151090 + 6210572151091.

It is an arithmetic number, because the mean of its divisors is an integer number (6210572151091).

Almost surely, 2^{12421144302181} is an apocalyptic number.

It is an amenable number.

12421144302181 is a deficient number, since it is larger than the sum of its proper divisors (1).

12421144302181 is an equidigital number, since it uses as much as digits as its factorization.

12421144302181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12288, while the sum is 34.

The spelling of 12421144302181 in words is "twelve trillion, four hundred twenty-one billion, one hundred forty-four million, three hundred two thousand, one hundred eighty-one".