127120121021717 has 2 divisors, whose sum is σ = 127120121021718. Its totient is φ = 127120121021716.

The previous prime is 127120121021701. The next prime is 127120121021791. The reversal of 127120121021717 is 717120121021721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116433034291396 + 10687086730321 = 10790414^2 + 3269111^2 .

It is an emirp because it is prime and its reverse (717120121021721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 127120121021717 - 2⁴ = 127120121021701 is a prime.

It is a super-4 number, since 4×127120121021717⁴ (a number of 58 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127120121041717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63560060510858 + 63560060510859.

It is an arithmetic number, because the mean of its divisors is an integer number (63560060510859).

Almost surely, 2^{127120121021717} is an apocalyptic number.

It is an amenable number.

127120121021717 is a deficient number, since it is larger than the sum of its proper divisors (1).

127120121021717 is an equidigital number, since it uses as much as digits as its factorization.

127120121021717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5488, while the sum is 35.

The spelling of 127120121021717 in words is "one hundred twenty-seven trillion, one hundred twenty billion, one hundred twenty-one million, twenty-one thousand, seven hundred seventeen".