21044066 has 8 divisors (see below), whose sum is σ = 31749084. Its totient is φ = 10461040.

The previous prime is 21044063. The next prime is 21044081. The reversal of 21044066 is 66044012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19616041 + 1428025 = 4429^2 + 1195^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21044063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30065 + ... + 30756.

Almost surely, 2^21044066 is an apocalyptic number.

21044066 is a deficient number, since it is larger than the sum of its proper divisors (10705018).

21044066 is a wasteful number, since it uses less digits than its factorization.

21044066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60996.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 21044066 is about 4587.3811701231. The cubic root of 21044066 is about 276.0852586144.

Adding to 21044066 its reverse (66044012), we get a palindrome (87088078).

The spelling of 21044066 in words is "twenty-one million, forty-four thousand, sixty-six".