21303652 has 12 divisors (see below), whose sum is σ = 39474540. Its totient is φ = 10025216.

The previous prime is 21303649. The next prime is 21303671. The reversal of 21303652 is 25630312.

It can be written as a sum of positive squares in 2 ways, for example, as 12916836 + 8386816 = 3594^2 + 2896^2 .

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, 156577 + ... + 156712.

It is an arithmetic number, because the mean of its divisors is an integer number (3289545).

Almost surely, 2^21303652 is an apocalyptic number.

It is an amenable number.

21303652 is a deficient number, since it is larger than the sum of its proper divisors (18170888).

21303652 is a wasteful number, since it uses less digits than its factorization.

21303652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313310 (or 313308 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 21303652 is about 4615.5879365472. The cubic root of 21303652 is about 277.2158257475.

Adding to 21303652 its reverse (25630312), we get a palindrome (46933964).

The spelling of 21303652 in words is "twenty-one million, three hundred three thousand, six hundred fifty-two".