21336066 has 12 divisors (see below), whose sum is σ = 46228182. Its totient is φ = 7112016.

The previous prime is 21336061. The next prime is 21336103. The reversal of 21336066 is 66063312.

21336066 is a `hidden beast` number, since 21 + 33 + 606 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18020025 + 3316041 = 4245^2 + 1821^2 .

It is not an unprimeable number, because it can be changed into a prime (21336061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 592651 + ... + 592686.

Almost surely, 2^21336066 is an apocalyptic number.

21336066 is an abundant number, since it is smaller than the sum of its proper divisors (24892116).

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

21336066 is a wasteful number, since it uses less digits than its factorization.

21336066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1185345 (or 1185342 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 21336066 is about 4619.0979638886. The cubic root of 21336066 is about 277.3563512674.

Adding to 21336066 its reverse (66063312), we get a palindrome (87399378).

The spelling of 21336066 in words is "twenty-one million, three hundred thirty-six thousand, sixty-six".