57204121 has 4 divisors (see below), whose sum is σ = 61604452. Its totient is φ = 52803792.

The previous prime is 57204089. The next prime is 57204157. The reversal of 57204121 is 12140275.

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 2975625 + 54228496 = 1725^2 + 7364^2 .

It is a cyclic number.

It is not a de Polignac number, because 57204121 - 2⁵ = 57204089 is a prime.

It is a super-2 number, since 2×57204121² = 6544622918765282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 57204092 and 57204101.

It is not an unprimeable number, because it can be changed into a prime (57204221) 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, 2200146 + ... + 2200171.

It is an arithmetic number, because the mean of its divisors is an integer number (15401113).

Almost surely, 2^57204121 is an apocalyptic number.

It is an amenable number.

57204121 is a deficient number, since it is larger than the sum of its proper divisors (4400331).

57204121 is a wasteful number, since it uses less digits than its factorization.

57204121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4400330.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 57204121 is about 7563.3405979104. The cubic root of 57204121 is about 385.3089575987.

Adding to 57204121 its reverse (12140275), we get a palindrome (69344396).

The spelling of 57204121 in words is "fifty-seven million, two hundred four thousand, one hundred twenty-one".