21304352 has 12 divisors (see below), whose sum is σ = 41943006. Its totient is φ = 10652160.

The previous prime is 21304351. The next prime is 21304373. The reversal of 21304352 is 25340312.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18627856 + 2676496 = 4316^2 + 1636^2 .

It is not an unprimeable number, because it can be changed into a prime (21304351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332849 + ... + 332912.

Almost surely, 2^21304352 is an apocalyptic number.

It is an amenable number.

21304352 is a deficient number, since it is larger than the sum of its proper divisors (20638654).

21304352 is an equidigital number, since it uses as much as digits as its factorization.

21304352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665771 (or 665763 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 21304352 is about 4615.6637659171. The cubic root of 21304352 is about 277.2188619867.

Adding to 21304352 its reverse (25340312), we get a palindrome (46644664).

The spelling of 21304352 in words is "twenty-one million, three hundred four thousand, three hundred fifty-two".