1211340129599 has 2 divisors, whose sum is σ = 1211340129600. Its totient is φ = 1211340129598.

The previous prime is 1211340129589. The next prime is 1211340129661. The reversal of 1211340129599 is 9959210431121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1211340129599 - 2²⁰ = 1211339081023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211340129539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605670064799 + 605670064800.

It is an arithmetic number, because the mean of its divisors is an integer number (605670064800).

Almost surely, 2^{1211340129599} is an apocalyptic number.

1211340129599 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211340129599 is an equidigital number, since it uses as much as digits as its factorization.

1211340129599 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 174960, while the sum is 47.

The spelling of 1211340129599 in words is "one trillion, two hundred eleven billion, three hundred forty million, one hundred twenty-nine thousand, five hundred ninety-nine".