121565341241 has 2 divisors, whose sum is σ = 121565341242. Its totient is φ = 121565341240.

The previous prime is 121565341229. The next prime is 121565341273. The reversal of 121565341241 is 142143565121.

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., 110636729641 + 10928611600 = 332621^2 + 104540^2 .

It is an emirp because it is prime and its reverse (142143565121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121565341241 - 2¹⁰ = 121565340217 is a prime.

It is not a weakly prime, because it can be changed into another prime (121565341211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60782670620 + 60782670621.

It is an arithmetic number, because the mean of its divisors is an integer number (60782670621).

Almost surely, 2^121565341241 is an apocalyptic number.

It is an amenable number.

121565341241 is a deficient number, since it is larger than the sum of its proper divisors (1).

121565341241 is an equidigital number, since it uses as much as digits as its factorization.

121565341241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28800, while the sum is 35.

The spelling of 121565341241 in words is "one hundred twenty-one billion, five hundred sixty-five million, three hundred forty-one thousand, two hundred forty-one".