21324320011 has 4 divisors (see below), whose sum is σ = 21642593512. Its totient is φ = 21006046512.

The previous prime is 21324319993. The next prime is 21324320051. The reversal of 21324320011 is 11002342312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21324320011 - 2²⁹ = 20787449099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21324320051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159136650 + ... + 159136783.

It is an arithmetic number, because the mean of its divisors is an integer number (5410648378).

Almost surely, 2^21324320011 is an apocalyptic number.

21324320011 is a deficient number, since it is larger than the sum of its proper divisors (318273501).

21324320011 is an equidigital number, since it uses as much as digits as its factorization.

21324320011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318273500.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21324320011 its reverse (11002342312), we get a palindrome (32326662323).

The spelling of 21324320011 in words is "twenty-one billion, three hundred twenty-four million, three hundred twenty thousand, eleven".