57043921 has 4 divisors (see below), whose sum is σ = 62229744. Its totient is φ = 51858100.

The previous prime is 57043919. The next prime is 57043939. The reversal of 57043921 is 12934075.

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 57043921 - 2¹ = 57043919 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57043321) 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, 2592895 + ... + 2592916.

It is an arithmetic number, because the mean of its divisors is an integer number (15557436).

Almost surely, 2^57043921 is an apocalyptic number.

It is an amenable number.

57043921 is a deficient number, since it is larger than the sum of its proper divisors (5185823).

57043921 is a wasteful number, since it uses less digits than its factorization.

57043921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5185822.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 57043921 is about 7552.7426144415. The cubic root of 57043921 is about 384.9489357135.

Adding to 57043921 its reverse (12934075), we get a palindrome (69977996).

The spelling of 57043921 in words is "fifty-seven million, forty-three thousand, nine hundred twenty-one".