127864135717321 has 4 divisors (see below), whose sum is σ = 129615699220372. Its totient is φ = 126112572214272.

The previous prime is 127864135717301. The next prime is 127864135717399. The reversal of 127864135717321 is 123717531468721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 89979187461696 + 37884948255625 = 9485736^2 + 6155075^2 .

It is a cyclic number.

It is not a de Polignac number, because 127864135717321 - 2¹⁹ = 127864135193033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127864135717301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 875781751416 + ... + 875781751561.

It is an arithmetic number, because the mean of its divisors is an integer number (32403924805093).

Almost surely, 2^{127864135717321} is an apocalyptic number.

It is an amenable number.

127864135717321 is a deficient number, since it is larger than the sum of its proper divisors (1751563503051).

127864135717321 is an equidigital number, since it uses as much as digits as its factorization.

127864135717321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1751563503050.

The product of its digits is 11854080, while the sum is 58.

The spelling of 127864135717321 in words is "one hundred twenty-seven trillion, eight hundred sixty-four billion, one hundred thirty-five million, seven hundred seventeen thousand, three hundred twenty-one".