57200021 has 4 divisors (see below), whose sum is σ = 57370092. Its totient is φ = 57029952.

The previous prime is 57200009. The next prime is 57200023. The reversal of 57200021 is 12000275.

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 8059921 + 49140100 = 2839^2 + 7010^2 .

It is a cyclic number.

It is not a de Polignac number, because 57200021 - 2⁶ = 57199957 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 (57200023) 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, 84530 + ... + 85203.

It is an arithmetic number, because the mean of its divisors is an integer number (14342523).

Almost surely, 2^57200021 is an apocalyptic number.

It is an amenable number.

57200021 is a deficient number, since it is larger than the sum of its proper divisors (170071).

57200021 is a wasteful number, since it uses less digits than its factorization.

57200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170070.

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 57200021 is about 7563.0695488009. The cubic root of 57200021 is about 385.2997519422.

Adding to 57200021 its reverse (12000275), we get a palindrome (69200296).

The spelling of 57200021 in words is "fifty-seven million, two hundred thousand, twenty-one".