21304132 has 12 divisors (see below), whose sum is σ = 37652076. Its totient is φ = 10546400.

The previous prime is 21304121. The next prime is 21304139. The reversal of 21304132 is 23140312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13719616 + 7584516 = 3704^2 + 2754^2 .

It is not an unprimeable number, because it can be changed into a prime (21304139) 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, 25963 + ... + 26770.

It is an arithmetic number, because the mean of its divisors is an integer number (3137673).

Almost surely, 2^21304132 is an apocalyptic number.

It is an amenable number.

21304132 is a deficient number, since it is larger than the sum of its proper divisors (16347944).

21304132 is a wasteful number, since it uses less digits than its factorization.

21304132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52838 (or 52836 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 21304132 is about 4615.6399339637. The cubic root of 21304132 is about 277.2179077473.

Adding to 21304132 its reverse (23140312), we get a palindrome (44444444).

The spelling of 21304132 in words is "twenty-one million, three hundred four thousand, one hundred thirty-two".