57127211721 has 6 divisors (see below), whose sum is σ = 82517083610. Its totient is φ = 38084807808.

The previous prime is 57127211693. The next prime is 57127211731. The reversal of 57127211721 is 12711272175.

It is a happy number.

57127211721 is a `hidden beast` number, since 571 + 2 + 7 + 2 + 11 + 72 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 39275312400 + 17851899321 = 198180^2 + 133611^2 .

It is not a de Polignac number, because 57127211721 - 2¹¹ = 57127209673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57127211731) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3173733976 + ... + 3173733993.

Almost surely, 2^57127211721 is an apocalyptic number.

It is an amenable number.

57127211721 is a deficient number, since it is larger than the sum of its proper divisors (25389871889).

57127211721 is a wasteful number, since it uses less digits than its factorization.

57127211721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6347467975 (or 6347467972 counting only the distinct ones).

The product of its digits is 13720, while the sum is 36.

Adding to 57127211721 its reverse (12711272175), we get a palindrome (69838483896).

The spelling of 57127211721 in words is "fifty-seven billion, one hundred twenty-seven million, two hundred eleven thousand, seven hundred twenty-one".