57242221 has 2 divisors, whose sum is σ = 57242222. Its totient is φ = 57242220.

The previous prime is 57242209. The next prime is 57242233. The reversal of 57242221 is 12224275.

It is a balanced prime because it is at equal distance from previous prime (57242209) and next prime (57242233).

It can be written as a sum of positive squares in only one way, i.e., 57229225 + 12996 = 7565^2 + 114^2 .

It is a cyclic number.

It is not a de Polignac number, because 57242221 - 2²⁵ = 23687789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57242021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28621110 + 28621111.

It is an arithmetic number, because the mean of its divisors is an integer number (28621111).

Almost surely, 2^57242221 is an apocalyptic number.

It is an amenable number.

57242221 is a deficient number, since it is larger than the sum of its proper divisors (1).

57242221 is an equidigital number, since it uses as much as digits as its factorization.

57242221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2240, while the sum is 25.

The square root of 57242221 is about 7565.8589069583. The cubic root of 57242221 is about 385.3944818176.

Adding to 57242221 its reverse (12224275), we get a palindrome (69466496).

The spelling of 57242221 in words is "fifty-seven million, two hundred forty-two thousand, two hundred twenty-one".