12456102131621 has 2 divisors, whose sum is σ = 12456102131622. Its totient is φ = 12456102131620.

The previous prime is 12456102131597. The next prime is 12456102131663. The reversal of 12456102131621 is 12613120165421.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8671929494596 + 3784172637025 = 2944814^2 + 1945295^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12456102131621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12456102131021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6228051065810 + 6228051065811.

It is an arithmetic number, because the mean of its divisors is an integer number (6228051065811).

Almost surely, 2^{12456102131621} is an apocalyptic number.

It is an amenable number.

12456102131621 is a deficient number, since it is larger than the sum of its proper divisors (1).

12456102131621 is an equidigital number, since it uses as much as digits as its factorization.

12456102131621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 35.

The spelling of 12456102131621 in words is "twelve trillion, four hundred fifty-six billion, one hundred two million, one hundred thirty-one thousand, six hundred twenty-one".