21226330 has 8 divisors (see below), whose sum is σ = 38207412. Its totient is φ = 8490528.

The previous prime is 21226327. The next prime is 21226367. The reversal of 21226330 is 3362212.

It can be written as a sum of positive squares in 2 ways, for example, as 21040569 + 185761 = 4587^2 + 431^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21226298 and 21226307.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1061307 + ... + 1061326.

Almost surely, 2^21226330 is an apocalyptic number.

21226330 is a deficient number, since it is larger than the sum of its proper divisors (16981082).

21226330 is a wasteful number, since it uses less digits than its factorization.

21226330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2122640.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 21226330 is about 4607.2041413421. The cubic root of 21226330 is about 276.8800325032.

Adding to 21226330 its reverse (3362212), we get a palindrome (24588542).

The spelling of 21226330 in words is "twenty-one million, two hundred twenty-six thousand, three hundred thirty".