57356021 has 2 divisors, whose sum is σ = 57356022. Its totient is φ = 57356020.

The previous prime is 57355931. The next prime is 57356051. The reversal of 57356021 is 12065375.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56415121 + 940900 = 7511^2 + 970^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57356021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57356051) 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, 28678010 + 28678011.

It is an arithmetic number, because the mean of its divisors is an integer number (28678011).

Almost surely, 2^57356021 is an apocalyptic number.

It is an amenable number.

57356021 is a deficient number, since it is larger than the sum of its proper divisors (1).

57356021 is an equidigital number, since it uses as much as digits as its factorization.

57356021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 57356021 is about 7573.3757994701. The cubic root of 57356021 is about 385.6497063677.

The spelling of 57356021 in words is "fifty-seven million, three hundred fifty-six thousand, twenty-one".