1243121006329 has 2 divisors, whose sum is σ = 1243121006330. Its totient is φ = 1243121006328.

The previous prime is 1243121006327. The next prime is 1243121006333. The reversal of 1243121006329 is 9236001213421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 995908194304 + 247212812025 = 997952^2 + 497205^2 .

It is an emirp because it is prime and its reverse (9236001213421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1243121006329 - 2¹ = 1243121006327 is a prime.

Together with 1243121006327, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1243121006294 and 1243121006303.

It is not a weakly prime, because it can be changed into another prime (1243121006321) 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, 621560503164 + 621560503165.

It is an arithmetic number, because the mean of its divisors is an integer number (621560503165).

Almost surely, 2^{1243121006329} is an apocalyptic number.

It is an amenable number.

1243121006329 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243121006329 is an equidigital number, since it uses as much as digits as its factorization.

1243121006329 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 34.

The spelling of 1243121006329 in words is "one trillion, two hundred forty-three billion, one hundred twenty-one million, six thousand, three hundred twenty-nine".