121741701711557 has 2 divisors, whose sum is σ = 121741701711558. Its totient is φ = 121741701711556.

The previous prime is 121741701711541. The next prime is 121741701711577. The reversal of 121741701711557 is 755117107147121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96984797863396 + 24756903848161 = 9848086^2 + 4975631^2 .

It is a cyclic number.

It is not a de Polignac number, because 121741701711557 - 2⁴ = 121741701711541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121741701711517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60870850855778 + 60870850855779.

It is an arithmetic number, because the mean of its divisors is an integer number (60870850855779).

Almost surely, 2^{121741701711557} is an apocalyptic number.

It is an amenable number.

121741701711557 is a deficient number, since it is larger than the sum of its proper divisors (1).

121741701711557 is an equidigital number, since it uses as much as digits as its factorization.

121741701711557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480200, while the sum is 50.

Adding to 121741701711557 its reverse (755117107147121), we get a palindrome (876858808858678).

The spelling of 121741701711557 in words is "one hundred twenty-one trillion, seven hundred forty-one billion, seven hundred one million, seven hundred eleven thousand, five hundred fifty-seven".