57050821 has 2 divisors, whose sum is σ = 57050822. Its totient is φ = 57050820.

The previous prime is 57050789. The next prime is 57050837. The reversal of 57050821 is 12805075.

57050821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55577025 + 1473796 = 7455^2 + 1214^2 .

It is a cyclic number.

It is not a de Polignac number, because 57050821 - 2⁵ = 57050789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 57050821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57051821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28525410 + 28525411.

It is an arithmetic number, because the mean of its divisors is an integer number (28525411).

Almost surely, 2^57050821 is an apocalyptic number.

It is an amenable number.

57050821 is a deficient number, since it is larger than the sum of its proper divisors (1).

57050821 is an equidigital number, since it uses as much as digits as its factorization.

57050821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 57050821 is about 7553.1993883387. The cubic root of 57050821 is about 384.9644561553.

Adding to 57050821 its reverse (12805075), we get a palindrome (69855896).

The spelling of 57050821 in words is "fifty-seven million, fifty thousand, eight hundred twenty-one".