21144000324 has 12 divisors (see below), whose sum is σ = 49336000784. Its totient is φ = 7048000104.

The previous prime is 21144000323. The next prime is 21144000331. The reversal of 21144000324 is 42300044112.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 21144000324.

It is not an unprimeable number, because it can be changed into a prime (21144000323) 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, 881000002 + ... + 881000025.

Almost surely, 2^21144000324 is an apocalyptic number.

It is an amenable number.

21144000324 is an abundant number, since it is smaller than the sum of its proper divisors (28192000460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21144000324 is a wasteful number, since it uses less digits than its factorization.

21144000324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1762000034 (or 1762000032 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21144000324 its reverse (42300044112), we get a palindrome (63444044436).

The spelling of 21144000324 in words is "twenty-one billion, one hundred forty-four million, three hundred twenty-four", and thus it is an aban number.