121405325617 has 2 divisors, whose sum is σ = 121405325618. Its totient is φ = 121405325616.

The previous prime is 121405325609. The next prime is 121405325647. The reversal of 121405325617 is 716523504121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121049022241 + 356303376 = 347921^2 + 18876^2 .

It is a cyclic number.

It is not a de Polignac number, because 121405325617 - 2³ = 121405325609 is a prime.

It is not a weakly prime, because it can be changed into another prime (121405325647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60702662808 + 60702662809.

It is an arithmetic number, because the mean of its divisors is an integer number (60702662809).

Almost surely, 2^121405325617 is an apocalyptic number.

It is an amenable number.

121405325617 is a deficient number, since it is larger than the sum of its proper divisors (1).

121405325617 is an equidigital number, since it uses as much as digits as its factorization.

121405325617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50400, while the sum is 37.

Adding to 121405325617 its reverse (716523504121), we get a palindrome (837928829738).

The spelling of 121405325617 in words is "one hundred twenty-one billion, four hundred five million, three hundred twenty-five thousand, six hundred seventeen".