57201921 has 12 divisors (see below), whose sum is σ = 94428672. Its totient is φ = 32686776.

The previous prime is 57201899. The next prime is 57201979. The reversal of 57201921 is 12910275.

57201921 is a `hidden beast` number, since 572 + 0 + 1 + 92 + 1 = 666.

It is not a de Polignac number, because 57201921 - 2⁹ = 57201409 is a prime.

It is a super-3 number, since 3×57201921³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (57201421) 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 11 ways as a sum of consecutive naturals, for example, 453921 + ... + 454046.

It is an arithmetic number, because the mean of its divisors is an integer number (7869056).

Almost surely, 2^57201921 is an apocalyptic number.

It is an amenable number.

57201921 is a deficient number, since it is larger than the sum of its proper divisors (37226751).

57201921 is a wasteful number, since it uses less digits than its factorization.

57201921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907980 (or 907977 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 57201921 is about 7563.1951581326. The cubic root of 57201921 is about 385.3040180328.

The spelling of 57201921 in words is "fifty-seven million, two hundred one thousand, nine hundred twenty-one".