21236330 has 16 divisors (see below), whose sum is σ = 38296584. Its totient is φ = 8478720.

The previous prime is 21236329. The next prime is 21236359. The reversal of 21236330 is 3363212.

It can be written as a sum of positive squares in 4 ways, for example, as 21224449 + 11881 = 4607^2 + 109^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4754 + ... + 8066.

Almost surely, 2^21236330 is an apocalyptic number.

21236330 is a deficient number, since it is larger than the sum of its proper divisors (17060254).

21236330 is a wasteful number, since it uses less digits than its factorization.

21236330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3961.

The product of its (nonzero) digits is 648, while the sum is 20.

The square root of 21236330 is about 4608.2892704343. The cubic root of 21236330 is about 276.9235062711.

Adding to 21236330 its reverse (3363212), we get a palindrome (24599542).

The spelling of 21236330 in words is "twenty-one million, two hundred thirty-six thousand, three hundred thirty".