21202330 has 16 divisors (see below), whose sum is σ = 39095784. Its totient is φ = 8273920.

The previous prime is 21202283. The next prime is 21202367. The reversal of 21202330 is 3320212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 13300609 + 7901721 = 3647^2 + 2811^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21202330.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25447 + ... + 26266.

Almost surely, 2^21202330 is an apocalyptic number.

21202330 is a deficient number, since it is larger than the sum of its proper divisors (17893454).

21202330 is a wasteful number, since it uses less digits than its factorization.

21202330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51761.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 21202330 is about 4604.5987881682. The cubic root of 21202330 is about 276.7756397225.

Adding to 21202330 its reverse (3320212), we get a palindrome (24522542).

The spelling of 21202330 in words is "twenty-one million, two hundred two thousand, three hundred thirty".