21124323 has 24 divisors (see below), whose sum is σ = 33433920. Its totient is φ = 12746160.

The previous prime is 21124321. The next prime is 21124339. The reversal of 21124323 is 32342112.

It is not a de Polignac number, because 21124323 - 2¹ = 21124321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21124296 and 21124305.

It is not an unprimeable number, because it can be changed into a prime (21124321) 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, 37240 + ... + 37802.

It is an arithmetic number, because the mean of its divisors is an integer number (1393080).

Almost surely, 2^21124323 is an apocalyptic number.

21124323 is a deficient number, since it is larger than the sum of its proper divisors (12309597).

21124323 is a wasteful number, since it uses less digits than its factorization.

21124323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 959 (or 956 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 21124323 is about 4596.1204292316. The cubic root of 21124323 is about 276.4357876105.

Adding to 21124323 its reverse (32342112), we get a palindrome (53466435).

The spelling of 21124323 in words is "twenty-one million, one hundred twenty-four thousand, three hundred twenty-three".