21327066 has 12 divisors (see below), whose sum is σ = 46208682. Its totient is φ = 7109016.

The previous prime is 21327043. The next prime is 21327067. The reversal of 21327066 is 66072312.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20061441 + 1265625 = 4479^2 + 1125^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21327067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 592401 + ... + 592436.

Almost surely, 2^21327066 is an apocalyptic number.

21327066 is an abundant number, since it is smaller than the sum of its proper divisors (24881616).

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

21327066 is a wasteful number, since it uses less digits than its factorization.

21327066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1184845 (or 1184842 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 21327066 is about 4618.1236449450. The cubic root of 21327066 is about 277.3173475412.

Adding to 21327066 its reverse (66072312), we get a palindrome (87399378).

The spelling of 21327066 in words is "twenty-one million, three hundred twenty-seven thousand, sixty-six".