21451324304 has 40 divisors (see below), whose sum is σ = 42431159232. Its totient is φ = 10502161280.

The previous prime is 21451324303. The next prime is 21451324309. The reversal of 21451324304 is 40342315412.

It is not an unprimeable number, because it can be changed into a prime (21451324303) 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 7 ways as a sum of consecutive naturals, for example, 401399 + ... + 451689.

Almost surely, 2^21451324304 is an apocalyptic number.

It is an amenable number.

21451324304 is a deficient number, since it is larger than the sum of its proper divisors (20979834928).

21451324304 is a wasteful number, since it uses less digits than its factorization.

21451324304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50855 (or 50849 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 21451324304 its reverse (40342315412), we get a palindrome (61793639716).

The spelling of 21451324304 in words is "twenty-one billion, four hundred fifty-one million, three hundred twenty-four thousand, three hundred four".