57030821 has 4 divisors (see below), whose sum is σ = 57834144. Its totient is φ = 56227500.

The previous prime is 57030803. The next prime is 57030829. The reversal of 57030821 is 12803075.

57030821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57030821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57030829) 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 in 3 ways as a sum of consecutive naturals, for example, 401555 + ... + 401696.

It is an arithmetic number, because the mean of its divisors is an integer number (14458536).

Almost surely, 2^57030821 is an apocalyptic number.

It is an amenable number.

57030821 is a deficient number, since it is larger than the sum of its proper divisors (803323).

57030821 is an equidigital number, since it uses as much as digits as its factorization.

57030821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803322.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 57030821 is about 7551.8753300091. The cubic root of 57030821 is about 384.9194659234.

Adding to 57030821 its reverse (12803075), we get a palindrome (69833896).

The spelling of 57030821 in words is "fifty-seven million, thirty thousand, eight hundred twenty-one".