127172011721571 has 12 divisors (see below), whose sum is σ = 183712579595272. Its totient is φ = 84772260943776.

The previous prime is 127172011721543. The next prime is 127172011721581. The reversal of 127172011721571 is 175127110271721.

It is a happy number.

127172011721571 is a `hidden beast` number, since 1 + 2 + 7 + 1 + 7 + 2 + 0 + 1 + 1 + 72 + 1 + 571 = 666.

It is not a de Polignac number, because 127172011721571 - 2⁶ = 127172011721507 is a prime.

It is a super-2 number, since 2×127172011721571² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127172011721581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 756594961 + ... + 756763026.

Almost surely, 2^{127172011721571} is an apocalyptic number.

127172011721571 is a deficient number, since it is larger than the sum of its proper divisors (56540567873701).

127172011721571 is a wasteful number, since it uses less digits than its factorization.

127172011721571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1513367330 (or 1513367327 counting only the distinct ones).

The product of its (nonzero) digits is 96040, while the sum is 45.

The spelling of 127172011721571 in words is "one hundred twenty-seven trillion, one hundred seventy-two billion, eleven million, seven hundred twenty-one thousand, five hundred seventy-one".