127745242547721 has 16 divisors (see below), whose sum is σ = 173267074893888. Its totient is φ = 83695837118400.

The previous prime is 127745242547717. The next prime is 127745242547729.

127745242547721 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 127745242547721 - 2² = 127745242547717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (127745242547729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 297847806 + ... + 298276391.

It is an arithmetic number, because the mean of its divisors is an integer number (10829192180868).

Almost surely, 2^{127745242547721} is an apocalyptic number.

It is an amenable number.

127745242547721 is a deficient number, since it is larger than the sum of its proper divisors (45521832346167).

127745242547721 is a wasteful number, since it uses less digits than its factorization.

127745242547721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596125432.

The product of its digits is 61465600, while the sum is 60.

The spelling of 127745242547721 in words is "one hundred twenty-seven trillion, seven hundred forty-five billion, two hundred forty-two million, five hundred forty-seven thousand, seven hundred twenty-one".