21324011 has 2 divisors, whose sum is σ = 21324012. Its totient is φ = 21324010.

The previous prime is 21323999. The next prime is 21324031. The reversal of 21324011 is 11042312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21324011 is a prime.

It is not a weakly prime, because it can be changed into another prime (21324031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10662005 + 10662006.

It is an arithmetic number, because the mean of its divisors is an integer number (10662006).

Almost surely, 2^21324011 is an apocalyptic number.

21324011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21324011 is an equidigital number, since it uses as much as digits as its factorization.

21324011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21324011 is about 4617.7928710586. The cubic root of 21324011 is about 277.3041054486.

Adding to 21324011 its reverse (11042312), we get a palindrome (32366323).

The spelling of 21324011 in words is "twenty-one million, three hundred twenty-four thousand, eleven".