21240024324 has 12 divisors (see below), whose sum is σ = 49560056784. Its totient is φ = 7080008104.

The previous prime is 21240024287. The next prime is 21240024343. The reversal of 21240024324 is 42342004212.

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

It is a super-3 number, since 3×21240024324³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 21240024294 and 21240024303.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 885001002 + ... + 885001025.

It is an arithmetic number, because the mean of its divisors is an integer number (4130004732).

Almost surely, 2^21240024324 is an apocalyptic number.

It is an amenable number.

21240024324 is an abundant number, since it is smaller than the sum of its proper divisors (28320032460).

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

21240024324 is a wasteful number, since it uses less digits than its factorization.

21240024324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1770002034 (or 1770002032 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 21240024324 its reverse (42342004212), we get a palindrome (63582028536).

The spelling of 21240024324 in words is "twenty-one billion, two hundred forty million, twenty-four thousand, three hundred twenty-four".