21222303 has 4 divisors (see below), whose sum is σ = 28296408. Its totient is φ = 14148200.

The previous prime is 21222293. The next prime is 21222343. The reversal of 21222303 is 30322212.

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

It is a cyclic number.

It is not a de Polignac number, because 21222303 - 2⁹ = 21221791 is a prime.

It is a super-2 number, since 2×21222303² = 900772289247618, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3537048 + ... + 3537053.

It is an arithmetic number, because the mean of its divisors is an integer number (7074102).

Almost surely, 2^21222303 is an apocalyptic number.

21222303 is a deficient number, since it is larger than the sum of its proper divisors (7074105).

21222303 is an equidigital number, since it uses as much as digits as its factorization.

21222303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7074104.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 21222303 is about 4606.7670876657. The cubic root of 21222303 is about 276.8625217605.

Adding to 21222303 its reverse (30322212), we get a palindrome (51544515).

Subtracting 21222303 from its reverse (30322212), we obtain a palindrome (9099909).

The spelling of 21222303 in words is "twenty-one million, two hundred twenty-two thousand, three hundred three".