21079304 has 16 divisors (see below), whose sum is σ = 39584700. Its totient is φ = 10523392.

The previous prime is 21079297. The next prime is 21079309. The reversal of 21079304 is 40397012.

It can be written as a sum of positive squares in 2 ways, for example, as 17656804 + 3422500 = 4202^2 + 1850^2 .

It is not an unprimeable number, because it can be changed into a prime (21079309) 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, 4844 + ... + 8100.

Almost surely, 2^21079304 is an apocalyptic number.

It is an amenable number.

21079304 is a deficient number, since it is larger than the sum of its proper divisors (18505396).

21079304 is a wasteful number, since it uses less digits than its factorization.

21079304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4072 (or 4068 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 21079304 is about 4591.2203170835. The cubic root of 21079304 is about 276.2392730081.

It can be divided in two parts, 2107 and 9304, that added together give a palindrome (11411).

The spelling of 21079304 in words is "twenty-one million, seventy-nine thousand, three hundred four".