21324320012 has 6 divisors (see below), whose sum is σ = 37317560028. Its totient is φ = 10662160004.

The previous prime is 21324319993. The next prime is 21324320051. The reversal of 21324320012 is 21002342312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2665539998 + ... + 2665540005.

It is an arithmetic number, because the mean of its divisors is an integer number (6219593338).

Almost surely, 2^21324320012 is an apocalyptic number.

It is an amenable number.

21324320012 is a deficient number, since it is larger than the sum of its proper divisors (15993240016).

21324320012 is a wasteful number, since it uses less digits than its factorization.

21324320012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5331080007 (or 5331080005 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21324320012 its reverse (21002342312), we get a palindrome (42326662324).

The spelling of 21324320012 in words is "twenty-one billion, three hundred twenty-four million, three hundred twenty thousand, twelve".