57021066 has 12 divisors (see below), whose sum is σ = 123545682. Its totient is φ = 19007016.

The previous prime is 57021001. The next prime is 57021067. The reversal of 57021066 is 66012075.

Added to its reverse (66012075) it gives a triangular number (123033141 = T₁₅₆₈₆).

It can be written as a sum of positive squares in only one way, i.e., 56565441 + 455625 = 7521^2 + 675^2 .

It is not an unprimeable number, because it can be changed into a prime (57021067) 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 5 ways as a sum of consecutive naturals, for example, 1583901 + ... + 1583936.

Almost surely, 2^57021066 is an apocalyptic number.

57021066 is an abundant number, since it is smaller than the sum of its proper divisors (66524616).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

57021066 is a wasteful number, since it uses less digits than its factorization.

57021066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3167845 (or 3167842 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 57021066 is about 7551.2294363236. The cubic root of 57021066 is about 384.8975181214.

Adding to 57021066 its reverse (66012075), we get a triangular number (123033141 = T₁₅₆₈₆).

The spelling of 57021066 in words is "fifty-seven million, twenty-one thousand, sixty-six".