57130021 has 4 divisors (see below), whose sum is σ = 61524652. Its totient is φ = 52735392.

The previous prime is 57130009. The next prime is 57130103. The reversal of 57130021 is 12003175.

57130021 is nontrivially palindromic in base 3.

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 17313921 + 39816100 = 4161^2 + 6310^2 .

It is a cyclic number.

It is not a de Polignac number, because 57130021 - 2⁷ = 57129893 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 (57130001) 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, 2197296 + ... + 2197321.

It is an arithmetic number, because the mean of its divisors is an integer number (15381163).

Almost surely, 2^57130021 is an apocalyptic number.

It is an amenable number.

57130021 is a deficient number, since it is larger than the sum of its proper divisors (4394631).

57130021 is a wasteful number, since it uses less digits than its factorization.

57130021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4394630.

The product of its (nonzero) digits is 210, while the sum is 19.

The square root of 57130021 is about 7558.4403814544. The cubic root of 57130021 is about 385.1425142828.

Adding to 57130021 its reverse (12003175), we get a palindrome (69133196).

The spelling of 57130021 in words is "fifty-seven million, one hundred thirty thousand, twenty-one".