121521065539 has 2 divisors, whose sum is σ = 121521065540. Its totient is φ = 121521065538.

The previous prime is 121521065521. The next prime is 121521065573. The reversal of 121521065539 is 935560125121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121521065539 - 2¹¹ = 121521063491 is a prime.

It is not a weakly prime, because it can be changed into another prime (121521065839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60760532769 + 60760532770.

It is an arithmetic number, because the mean of its divisors is an integer number (60760532770).

Almost surely, 2^121521065539 is an apocalyptic number.

121521065539 is a deficient number, since it is larger than the sum of its proper divisors (1).

121521065539 is an equidigital number, since it uses as much as digits as its factorization.

121521065539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81000, while the sum is 40.

The spelling of 121521065539 in words is "one hundred twenty-one billion, five hundred twenty-one million, sixty-five thousand, five hundred thirty-nine".