21222323 has 4 divisors (see below), whose sum is σ = 21491040. Its totient is φ = 20953608.

The previous prime is 21222293. The next prime is 21222343. The reversal of 21222323 is 32322212.

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 21222323 - 2¹⁸ = 20960179 is a prime.

It is a Duffinian 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, 134240 + ... + 134397.

It is an arithmetic number, because the mean of its divisors is an integer number (5372760).

Almost surely, 2^21222323 is an apocalyptic number.

21222323 is a deficient number, since it is larger than the sum of its proper divisors (268717).

21222323 is an equidigital number, since it uses as much as digits as its factorization.

21222323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268716.

The product of its digits is 288, while the sum is 17.

The square root of 21222323 is about 4606.7692583849. The cubic root of 21222323 is about 276.8626087326.

Adding to 21222323 its reverse (32322212), we get a palindrome (53544535).

The spelling of 21222323 in words is "twenty-one million, two hundred twenty-two thousand, three hundred twenty-three".