121705721076757 has 2 divisors, whose sum is σ = 121705721076758. Its totient is φ = 121705721076756.

The previous prime is 121705721076713. The next prime is 121705721076881. The reversal of 121705721076757 is 757670127507121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120415529506801 + 1290191569956 = 10973401^2 + 1135866^2 .

It is a cyclic number.

It is not a de Polignac number, because 121705721076757 - 2¹¹ = 121705721074709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121705721079757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60852860538378 + 60852860538379.

It is an arithmetic number, because the mean of its divisors is an integer number (60852860538379).

Almost surely, 2^{121705721076757} is an apocalyptic number.

It is an amenable number.

121705721076757 is a deficient number, since it is larger than the sum of its proper divisors (1).

121705721076757 is an equidigital number, since it uses as much as digits as its factorization.

121705721076757 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10084200, while the sum is 58.

The spelling of 121705721076757 in words is "one hundred twenty-one trillion, seven hundred five billion, seven hundred twenty-one million, seventy-six thousand, seven hundred fifty-seven".