21304466 has 16 divisors (see below), whose sum is σ = 32565624. Its totient is φ = 10450944.

The previous prime is 21304457. The next prime is 21304469. The reversal of 21304466 is 66440312.

It can be written as a sum of positive squares in 4 ways, for example, as 12453841 + 8850625 = 3529^2 + 2975^2 .

It is not an unprimeable number, because it can be changed into a prime (21304469) 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, 48986 + ... + 49418.

Almost surely, 2^21304466 is an apocalyptic number.

21304466 is a deficient number, since it is larger than the sum of its proper divisors (11261158).

21304466 is a wasteful number, since it uses less digits than its factorization.

21304466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 21304466 is about 4615.6761151537. The cubic root of 21304466 is about 277.2193564537.

Adding to 21304466 its reverse (66440312), we get a palindrome (87744778).

The spelling of 21304466 in words is "twenty-one million, three hundred four thousand, four hundred sixty-six".