21416066 has 16 divisors (see below), whose sum is σ = 36910080. Its totient is φ = 9129120.

The previous prime is 21416053. The next prime is 21416089. The reversal of 21416066 is 66061412.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1331 + ... + 6678.

It is an arithmetic number, because the mean of its divisors is an integer number (2306880).

Almost surely, 2^21416066 is an apocalyptic number.

21416066 is a deficient number, since it is larger than the sum of its proper divisors (15494014).

21416066 is a wasteful number, since it uses less digits than its factorization.

21416066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8209.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 21416066 is about 4627.7495610718. The cubic root of 21416066 is about 277.7025699446.

Adding to 21416066 its reverse (66061412), we get a palindrome (87477478).

The spelling of 21416066 in words is "twenty-one million, four hundred sixteen thousand, sixty-six".