57018021 has 8 divisors (see below), whose sum is σ = 78476544. Its totient is φ = 36785760.

The previous prime is 57018007. The next prime is 57018067. The reversal of 57018021 is 12081075.

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

It is not a de Polignac number, because 57018021 - 2¹³ = 57009829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 57017982 and 57018000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57018121) 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, 306456 + ... + 306641.

It is an arithmetic number, because the mean of its divisors is an integer number (9809568).

Almost surely, 2^57018021 is an apocalyptic number.

It is an amenable number.

57018021 is a deficient number, since it is larger than the sum of its proper divisors (21458523).

57018021 is a wasteful number, since it uses less digits than its factorization.

57018021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613131.

The product of its (nonzero) digits is 560, while the sum is 24.

The square root of 57018021 is about 7551.0278108348. The cubic root of 57018021 is about 384.8906666547.

Adding to 57018021 its reverse (12081075), we get a palindrome (69099096).

The spelling of 57018021 in words is "fifty-seven million, eighteen thousand, twenty-one".