57821492521 has 27 divisors (see below), whose sum is σ = 63998451279. Its totient is φ = 52216587072.

The previous prime is 57821492503. The next prime is 57821492623. The reversal of 57821492521 is 12529412875.

The square root of 57821492521 is 240461.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 24207936921 + 33613555600 = 155589^2 + 183340^2 .

It is not a de Polignac number, because 57821492521 - 2⁵ = 57821492489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57821499521) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 165677455 + ... + 165677803.

Almost surely, 2^57821492521 is an apocalyptic number.

57821492521 is the 240461-st square number.

57821492521 is the 120231-st centered octagonal number.

It is an amenable number.

57821492521 is a deficient number, since it is larger than the sum of its proper divisors (6176958758).

57821492521 is an frugal number, since it uses more digits than its factorization.

57821492521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830 (or 415 counting only the distinct ones).

The product of its digits is 403200, while the sum is 46.

The spelling of 57821492521 in words is "fifty-seven billion, eight hundred twenty-one million, four hundred ninety-two thousand, five hundred twenty-one".