57271021 has 2 divisors, whose sum is σ = 57271022. Its totient is φ = 57271020.

The previous prime is 57271007. The next prime is 57271033. The reversal of 57271021 is 12017275.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30085225 + 27185796 = 5485^2 + 5214^2 .

It is a cyclic number.

It is not a de Polignac number, because 57271021 - 2¹⁵ = 57238253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57271061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28635510 + 28635511.

It is an arithmetic number, because the mean of its divisors is an integer number (28635511).

Almost surely, 2^57271021 is an apocalyptic number.

It is an amenable number.

57271021 is a deficient number, since it is larger than the sum of its proper divisors (1).

57271021 is an equidigital number, since it uses as much as digits as its factorization.

57271021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 57271021 is about 7567.7619545015. The cubic root of 57271021 is about 385.4591048642.

Adding to 57271021 its reverse (12017275), we get a palindrome (69288296).

The spelling of 57271021 in words is "fifty-seven million, two hundred seventy-one thousand, twenty-one".