57336821 has 2 divisors, whose sum is σ = 57336822. Its totient is φ = 57336820.

The previous prime is 57336781. The next prime is 57336823. The reversal of 57336821 is 12863375.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57168721 + 168100 = 7561^2 + 410^2 .

It is a cyclic number.

It is not a de Polignac number, because 57336821 - 2¹⁰ = 57335797 is a prime.

It is a super-2 number, since 2×57336821² = 6575022084772082, which contains 22 as substring.

Together with 57336823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57336823) 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, 28668410 + 28668411.

It is an arithmetic number, because the mean of its divisors is an integer number (28668411).

Almost surely, 2^57336821 is an apocalyptic number.

It is an amenable number.

57336821 is a deficient number, since it is larger than the sum of its proper divisors (1).

57336821 is an equidigital number, since it uses as much as digits as its factorization.

57336821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 35.

The square root of 57336821 is about 7572.1080948439. The cubic root of 57336821 is about 385.6066693240.

The spelling of 57336821 in words is "fifty-seven million, three hundred thirty-six thousand, eight hundred twenty-one".