21123323 has 8 divisors (see below), whose sum is σ = 23303616. Its totient is φ = 19022400.

The previous prime is 21123313. The next prime is 21123331. The reversal of 21123323 is 32332112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21123323 - 2¹⁶ = 21057787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21123313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19283 + ... + 20348.

It is an arithmetic number, because the mean of its divisors is an integer number (2912952).

Almost surely, 2^21123323 is an apocalyptic number.

21123323 is a deficient number, since it is larger than the sum of its proper divisors (2180293).

21123323 is a wasteful number, since it uses less digits than its factorization.

21123323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39685.

The product of its digits is 216, while the sum is 17.

The square root of 21123323 is about 4596.0116405423. The cubic root of 21123323 is about 276.4314254960.

Adding to 21123323 its reverse (32332112), we get a palindrome (53455435).

The spelling of 21123323 in words is "twenty-one million, one hundred twenty-three thousand, three hundred twenty-three".