21324411 has 8 divisors (see below), whose sum is σ = 31591760. Its totient is φ = 14216256.

The previous prime is 21324389. The next prime is 21324419. The reversal of 21324411 is 11442312.

It is not a de Polignac number, because 21324411 - 2⁷ = 21324283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21324419) 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 7 ways as a sum of consecutive naturals, for example, 394870 + ... + 394923.

It is an arithmetic number, because the mean of its divisors is an integer number (3948970).

Almost surely, 2^21324411 is an apocalyptic number.

21324411 is a deficient number, since it is larger than the sum of its proper divisors (10267349).

21324411 is an equidigital number, since it uses as much as digits as its factorization.

21324411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789802 (or 789796 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 21324411 is about 4617.8361815898. The cubic root of 21324411 is about 277.3058393461.

Adding to 21324411 its reverse (11442312), we get a palindrome (32766723).

The spelling of 21324411 in words is "twenty-one million, three hundred twenty-four thousand, four hundred eleven".