21225322 has 4 divisors (see below), whose sum is σ = 31837986. Its totient is φ = 10612660.

The previous prime is 21225317. The next prime is 21225329. The reversal of 21225322 is 22352212.

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., 19900521 + 1324801 = 4461^2 + 1151^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21225322.

It is not an unprimeable number, because it can be changed into a prime (21225329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5306329 + ... + 5306332.

Almost surely, 2^21225322 is an apocalyptic number.

21225322 is a deficient number, since it is larger than the sum of its proper divisors (10612664).

21225322 is a wasteful number, since it uses less digits than its factorization.

21225322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10612663.

The product of its digits is 480, while the sum is 19.

The square root of 21225322 is about 4607.0947461497. The cubic root of 21225322 is about 276.8756495899.

Adding to 21225322 its reverse (22352212), we get a palindrome (43577534).

The spelling of 21225322 in words is "twenty-one million, two hundred twenty-five thousand, three hundred twenty-two".