57316221 has 8 divisors (see below), whose sum is σ = 84912960. Its totient is φ = 38210796.

The previous prime is 57316211. The next prime is 57316223. The reversal of 57316221 is 12261375.

It is a happy number.

57316221 is a `hidden beast` number, since 5 + 7 + 31 + 622 + 1 = 666.

It is not a de Polignac number, because 57316221 - 2⁶ = 57316157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2122823 = 57316221 / (5 + 7 + 3 + 1 + 6 + 2 + 2 + 1).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57316223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1061385 + ... + 1061438.

It is an arithmetic number, because the mean of its divisors is an integer number (10614120).

Almost surely, 2^57316221 is an apocalyptic number.

It is an amenable number.

57316221 is a deficient number, since it is larger than the sum of its proper divisors (27596739).

57316221 is a wasteful number, since it uses less digits than its factorization.

57316221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2122832 (or 2122826 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 57316221 is about 7570.7477173658. The cubic root of 57316221 is about 385.5604834772.

Adding to 57316221 its reverse (12261375), we get a palindrome (69577596).

The spelling of 57316221 in words is "fifty-seven million, three hundred sixteen thousand, two hundred twenty-one".