21204352 has 32 divisors (see below), whose sum is σ = 45496080. Its totient is φ = 9785856.

The previous prime is 21204349. The next prime is 21204397. The reversal of 21204352 is 25340212.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4708 + ... + 8035.

Almost surely, 2^21204352 is an apocalyptic number.

It is an amenable number.

21204352 is an abundant number, since it is smaller than the sum of its proper divisors (24291728).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21204352 is a wasteful number, since it uses less digits than its factorization.

21204352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12770 (or 12758 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 21204352 is about 4604.8183460371. The cubic root of 21204352 is about 276.7844378523.

Adding to 21204352 its reverse (25340212), we get a palindrome (46544564).

It can be divided in two parts, 2 and 1204352, that multiplied together give a square (2408704 = 1552²).

The spelling of 21204352 in words is "twenty-one million, two hundred four thousand, three hundred fifty-two".