57148021 has 4 divisors (see below), whose sum is σ = 65312032. Its totient is φ = 48984012.

The previous prime is 57148019. The next prime is 57148037. The reversal of 57148021 is 12084175.

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 not a de Polignac number, because 57148021 - 2¹ = 57148019 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 (57148051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4081995 + ... + 4082008.

It is an arithmetic number, because the mean of its divisors is an integer number (16328008).

Almost surely, 2^57148021 is an apocalyptic number.

It is an amenable number.

57148021 is a deficient number, since it is larger than the sum of its proper divisors (8164011).

57148021 is an equidigital number, since it uses as much as digits as its factorization.

57148021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8164010.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 57148021 is about 7559.6310095136. The cubic root of 57148021 is about 385.1829590856.

The spelling of 57148021 in words is "fifty-seven million, one hundred forty-eight thousand, twenty-one".