21324010111 has 4 divisors (see below), whose sum is σ = 21324877000. Its totient is φ = 21323143224.

The previous prime is 21324010063. The next prime is 21324010151. The reversal of 21324010111 is 11101042312.

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 21324010111 - 2¹¹ = 21324008063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21324010151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 395436 + ... + 446113.

It is an arithmetic number, because the mean of its divisors is an integer number (5331219250).

Almost surely, 2^21324010111 is an apocalyptic number.

21324010111 is a deficient number, since it is larger than the sum of its proper divisors (866889).

21324010111 is an equidigital number, since it uses as much as digits as its factorization.

21324010111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866888.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21324010111 its reverse (11101042312), we get a palindrome (32425052423).

The spelling of 21324010111 in words is "twenty-one billion, three hundred twenty-four million, ten thousand, one hundred eleven".