57386221 has 4 divisors (see below), whose sum is σ = 58031100. Its totient is φ = 56741344.

The previous prime is 57386179. The next prime is 57386243. The reversal of 57386221 is 12268375.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22458121 + 34928100 = 4739^2 + 5910^2 .

It is a cyclic number.

It is not a de Polignac number, because 57386221 - 2¹³ = 57378029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57386261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322306 + ... + 322483.

It is an arithmetic number, because the mean of its divisors is an integer number (14507775).

Almost surely, 2^57386221 is an apocalyptic number.

It is an amenable number.

57386221 is a deficient number, since it is larger than the sum of its proper divisors (644879).

57386221 is an equidigital number, since it uses as much as digits as its factorization.

57386221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644878.

The product of its digits is 20160, while the sum is 34.

The square root of 57386221 is about 7575.3693639320. The cubic root of 57386221 is about 385.7173806205.

The spelling of 57386221 in words is "fifty-seven million, three hundred eighty-six thousand, two hundred twenty-one".