57670021 has 2 divisors, whose sum is σ = 57670022. Its totient is φ = 57670020.

The previous prime is 57669973. The next prime is 57670033. The reversal of 57670021 is 12007675.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49547521 + 8122500 = 7039^2 + 2850^2 .

It is a cyclic number.

It is not a de Polignac number, because 57670021 - 2¹⁹ = 57145733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57670051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28835010 + 28835011.

It is an arithmetic number, because the mean of its divisors is an integer number (28835011).

Almost surely, 2^57670021 is an apocalyptic number.

It is an amenable number.

57670021 is a deficient number, since it is larger than the sum of its proper divisors (1).

57670021 is an equidigital number, since it uses as much as digits as its factorization.

57670021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 57670021 is about 7594.0780217219. The cubic root of 57670021 is about 386.3521824450.

Adding to 57670021 its reverse (12007675), we get a palindrome (69677696).

The spelling of 57670021 in words is "fifty-seven million, six hundred seventy thousand, twenty-one".