21294736 has 20 divisors (see below), whose sum is σ = 41333292. Its totient is φ = 10628096.

The previous prime is 21294731. The next prime is 21294773. The reversal of 21294736 is 63749212.

It can be written as a sum of positive squares in 2 ways, for example, as 11182336 + 10112400 = 3344^2 + 3180^2 .

It is not an unprimeable number, because it can be changed into a prime (21294731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12936 + ... + 14488.

Almost surely, 2^21294736 is an apocalyptic number.

It is an amenable number.

21294736 is a deficient number, since it is larger than the sum of its proper divisors (20038556).

21294736 is a wasteful number, since it uses less digits than its factorization.

21294736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2418 (or 2412 counting only the distinct ones).

The product of its digits is 18144, while the sum is 34.

The square root of 21294736 is about 4614.6219780173. The cubic root of 21294736 is about 277.1771469145.

The spelling of 21294736 in words is "twenty-one million, two hundred ninety-four thousand, seven hundred thirty-six".