21033322 has 4 divisors (see below), whose sum is σ = 31549986. Its totient is φ = 10516660.

The previous prime is 21033319. The next prime is 21033329. The reversal of 21033322 is 22333012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16232841 + 4800481 = 4029^2 + 2191^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21033296 and 21033305.

It is not an unprimeable number, because it can be changed into a prime (21033329) by changing a digit.

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 as a sum of consecutive naturals, namely, 5258329 + ... + 5258332.

Almost surely, 2^21033322 is an apocalyptic number.

21033322 is a deficient number, since it is larger than the sum of its proper divisors (10516664).

21033322 is a wasteful number, since it uses less digits than its factorization.

21033322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10516663.

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 21033322 is about 4586.2099821094. The cubic root of 21033322 is about 276.0382657159.

Adding to 21033322 its reverse (22333012), we get a palindrome (43366334).

The spelling of 21033322 in words is "twenty-one million, thirty-three thousand, three hundred twenty-two".