66021230 has 24 divisors (see below), whose sum is σ = 130626216. Its totient is φ = 24007280.

The previous prime is 66021187. The next prime is 66021239. The reversal of 66021230 is 3212066.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66021239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26072 + ... + 28491.

It is an arithmetic number, because the mean of its divisors is an integer number (5442759).

Almost surely, 2^66021230 is an apocalyptic number.

66021230 is a deficient number, since it is larger than the sum of its proper divisors (64604986).

66021230 is a wasteful number, since it uses less digits than its factorization.

66021230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54592 (or 54581 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 66021230 is about 8125.3449157559. The cubic root of 66021230 is about 404.1673284905.

Adding to 66021230 its reverse (3212066), we get a palindrome (69233296).

The spelling of 66021230 in words is "sixty-six million, twenty-one thousand, two hundred thirty".