57405221 has 2 divisors, whose sum is σ = 57405222. Its totient is φ = 57405220.

The previous prime is 57405199. The next prime is 57405247. The reversal of 57405221 is 12250475.

It is an a-pointer prime, because the next prime (57405247) can be obtained adding 57405221 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36602500 + 20802721 = 6050^2 + 4561^2 .

It is a cyclic number.

It is not a de Polignac number, because 57405221 - 2⁶ = 57405157 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57405421) 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, 28702610 + 28702611.

It is an arithmetic number, because the mean of its divisors is an integer number (28702611).

Almost surely, 2^57405221 is an apocalyptic number.

It is an amenable number.

57405221 is a deficient number, since it is larger than the sum of its proper divisors (1).

57405221 is an equidigital number, since it uses as much as digits as its factorization.

57405221 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 26.

The square root of 57405221 is about 7576.6233244104. The cubic root of 57405221 is about 385.7599449704.

Adding to 57405221 its reverse (12250475), we get a palindrome (69655696).

The spelling of 57405221 in words is "fifty-seven million, four hundred five thousand, two hundred twenty-one".