57242321 has 4 divisors (see below), whose sum is σ = 58096752. Its totient is φ = 56387892.

The previous prime is 57242309. The next prime is 57242351. The reversal of 57242321 is 12324275.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 57242321 - 2¹⁰ = 57241297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57242351) 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, 427115 + ... + 427248.

It is an arithmetic number, because the mean of its divisors is an integer number (14524188).

Almost surely, 2^57242321 is an apocalyptic number.

It is an amenable number.

57242321 is a deficient number, since it is larger than the sum of its proper divisors (854431).

57242321 is an equidigital number, since it uses as much as digits as its factorization.

57242321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854430.

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

The square root of 57242321 is about 7565.8655155904. The cubic root of 57242321 is about 385.3947062407.

Adding to 57242321 its reverse (12324275), we get a palindrome (69566596).

The spelling of 57242321 in words is "fifty-seven million, two hundred forty-two thousand, three hundred twenty-one".