57342221 has 2 divisors, whose sum is σ = 57342222. Its totient is φ = 57342220.

The previous prime is 57342199. The next prime is 57342223. The reversal of 57342221 is 12224375.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57078025 + 264196 = 7555^2 + 514^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57342221 is a prime.

It is a Sophie Germain prime.

Together with 57342223, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57342223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28671110 + 28671111.

It is an arithmetic number, because the mean of its divisors is an integer number (28671111).

Almost surely, 2^57342221 is an apocalyptic number.

It is an amenable number.

57342221 is a deficient number, since it is larger than the sum of its proper divisors (1).

57342221 is an equidigital number, since it uses as much as digits as its factorization.

57342221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3360, while the sum is 26.

The square root of 57342221 is about 7572.4646582206. The cubic root of 57342221 is about 385.6187744635.

Adding to 57342221 its reverse (12224375), we get a palindrome (69566596).

The spelling of 57342221 in words is "fifty-seven million, three hundred forty-two thousand, two hundred twenty-one".