57142321 has 8 divisors (see below), whose sum is σ = 61646184. Its totient is φ = 52765440.

The previous prime is 57142303. The next prime is 57142339. The reversal of 57142321 is 12324175.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (57142303) and next prime (57142339).

It can be written as a sum of positive squares in 4 ways, for example, as 11390625 + 45751696 = 3375^2 + 6764^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 57142321 - 2¹⁵ = 57109553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57142301) 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, 30810 + ... + 32611.

It is an arithmetic number, because the mean of its divisors is an integer number (7705773).

Almost surely, 2^57142321 is an apocalyptic number.

It is an amenable number.

57142321 is a deficient number, since it is larger than the sum of its proper divisors (4503863).

57142321 is a wasteful number, since it uses less digits than its factorization.

57142321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63491.

The product of its digits is 1680, while the sum is 25.

The square root of 57142321 is about 7559.2539975847. The cubic root of 57142321 is about 385.1701524836.

Adding to 57142321 its reverse (12324175), we get a palindrome (69466496).

The spelling of 57142321 in words is "fifty-seven million, one hundred forty-two thousand, three hundred twenty-one".