21201304 has 8 divisors (see below), whose sum is σ = 39752460. Its totient is φ = 10600648.

The previous prime is 21201293. The next prime is 21201311. The reversal of 21201304 is 40310212.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1325074 + ... + 1325089.

Almost surely, 2^21201304 is an apocalyptic number.

It is an amenable number.

21201304 is a deficient number, since it is larger than the sum of its proper divisors (18551156).

21201304 is a wasteful number, since it uses less digits than its factorization.

21201304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2650169 (or 2650165 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21201304 is about 4604.4873764622. The cubic root of 21201304 is about 276.7711751756.

Adding to 21201304 its reverse (40310212), we get a palindrome (61511516).

The spelling of 21201304 in words is "twenty-one million, two hundred one thousand, three hundred four".