21066312 has 32 divisors (see below), whose sum is σ = 53023680. Its totient is φ = 6974400.

The previous prime is 21066299. The next prime is 21066319. The reversal of 21066312 is 21366012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21066319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 718 + ... + 6530.

It is an arithmetic number, because the mean of its divisors is an integer number (1656990).

Almost surely, 2^21066312 is an apocalyptic number.

It is an amenable number.

21066312 is an abundant number, since it is smaller than the sum of its proper divisors (31957368).

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

21066312 is a wasteful number, since it uses less digits than its factorization.

21066312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5973 (or 5969 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 21066312 is about 4589.8052246256. The cubic root of 21066312 is about 276.1825089863.

The spelling of 21066312 in words is "twenty-one million, sixty-six thousand, three hundred twelve".