12918612093721 has 2 divisors, whose sum is σ = 12918612093722. Its totient is φ = 12918612093720.

The previous prime is 12918612093713. The next prime is 12918612093787. The reversal of 12918612093721 is 12739021681921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12819185391321 + 99426702400 = 3580389^2 + 315320^2 .

It is a cyclic number.

It is not a de Polignac number, because 12918612093721 - 2³ = 12918612093713 is a prime.

It is a super-3 number, since 3×12918612093721³ (a number of 40 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (12918612003721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6459306046860 + 6459306046861.

It is an arithmetic number, because the mean of its divisors is an integer number (6459306046861).

Almost surely, 2^{12918612093721} is an apocalyptic number.

It is an amenable number.

12918612093721 is a deficient number, since it is larger than the sum of its proper divisors (1).

12918612093721 is an equidigital number, since it uses as much as digits as its factorization.

12918612093721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 52.

The spelling of 12918612093721 in words is "twelve trillion, nine hundred eighteen billion, six hundred twelve million, ninety-three thousand, seven hundred twenty-one".