21241323 has 6 divisors (see below), whose sum is σ = 30681924. Its totient is φ = 14160876.

The previous prime is 21241271. The next prime is 21241327. The reversal of 21241323 is 32314212.

It is not a de Polignac number, because 21241323 - 2⁹ = 21240811 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21241296 and 21241305.

It is not an unprimeable number, because it can be changed into a prime (21241327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1180065 + ... + 1180082.

It is an arithmetic number, because the mean of its divisors is an integer number (5113654).

Almost surely, 2^21241323 is an apocalyptic number.

21241323 is a deficient number, since it is larger than the sum of its proper divisors (9440601).

21241323 is a wasteful number, since it uses less digits than its factorization.

21241323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2360153 (or 2360150 counting only the distinct ones).

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

The square root of 21241323 is about 4608.8309797605. The cubic root of 21241323 is about 276.9452076153.

Adding to 21241323 its reverse (32314212), we get a palindrome (53555535).

The spelling of 21241323 in words is "twenty-one million, two hundred forty-one thousand, three hundred twenty-three".