57020221 has 4 divisors (see below), whose sum is σ = 57049344. Its totient is φ = 56991100.

The previous prime is 57020213. The next prime is 57020237. The reversal of 57020221 is 12202075.

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 57020221 - 2³ = 57020213 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 (57020251) 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, 11395 + ... + 15616.

It is an arithmetic number, because the mean of its divisors is an integer number (14262336).

Almost surely, 2^57020221 is an apocalyptic number.

It is an amenable number.

57020221 is a deficient number, since it is larger than the sum of its proper divisors (29123).

57020221 is a wasteful number, since it uses less digits than its factorization.

57020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29122.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 57020221 is about 7551.1734849625. The cubic root of 57020221 is about 384.8956168357.

Adding to 57020221 its reverse (12202075), we get a palindrome (69222296).

The spelling of 57020221 in words is "fifty-seven million, twenty thousand, two hundred twenty-one".