57444021 has 12 divisors (see below), whose sum is σ = 83050240. Its totient is φ = 38261160.

The previous prime is 57444007. The next prime is 57444029. The reversal of 57444021 is 12044475.

It is not a de Polignac number, because 57444021 - 2⁵ = 57443989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57444029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11070 + ... + 15408.

Almost surely, 2^57444021 is an apocalyptic number.

It is an amenable number.

57444021 is a deficient number, since it is larger than the sum of its proper divisors (25606219).

57444021 is a wasteful number, since it uses less digits than its factorization.

57444021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5816 (or 5813 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 27.

The square root of 57444021 is about 7579.1833992852. The cubic root of 57444021 is about 385.8468366893.

Adding to 57444021 its reverse (12044475), we get a palindrome (69488496).

The spelling of 57444021 in words is "fifty-seven million, four hundred forty-four thousand, twenty-one".