21022323 has 24 divisors (see below), whose sum is σ = 33018048. Its totient is φ = 11861136.

The previous prime is 21022279. The next prime is 21022357. The reversal of 21022323 is 32322012.

It is not a de Polignac number, because 21022323 - 2⁶ = 21022259 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21022363) 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 in 23 ways as a sum of consecutive naturals, for example, 11340 + ... + 13062.

It is an arithmetic number, because the mean of its divisors is an integer number (1375752).

Almost surely, 2^21022323 is an apocalyptic number.

21022323 is a deficient number, since it is larger than the sum of its proper divisors (11995725).

21022323 is a wasteful number, since it uses less digits than its factorization.

21022323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1823 (or 1816 counting only the distinct ones).

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

The square root of 21022323 is about 4585.0106870104. The cubic root of 21022323 is about 275.9901408997.

Adding to 21022323 its reverse (32322012), we get a palindrome (53344335).

The spelling of 21022323 in words is "twenty-one million, twenty-two thousand, three hundred twenty-three".