21321030024 has 96 divisors (see below), whose sum is σ = 66829152000. Its totient is φ = 6014601216.

The previous prime is 21321029993. The next prime is 21321030037. The reversal of 21321030024 is 42003012312.

21321030024 is a `hidden beast` number, since 21 + 321 + 0 + 300 + 24 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21321029979 and 21321030006.

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 in 23 ways as a sum of consecutive naturals, for example, 227929 + ... + 307560.

It is an arithmetic number, because the mean of its divisors is an integer number (696137000).

Almost surely, 2^21321030024 is an apocalyptic number.

21321030024 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21321030024 is an abundant number, since it is smaller than the sum of its proper divisors (45508121976).

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

21321030024 is a wasteful number, since it uses less digits than its factorization.

21321030024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535587 (or 535580 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21321030024 its reverse (42003012312), we get a palindrome (63324042336).

The spelling of 21321030024 in words is "twenty-one billion, three hundred twenty-one million, thirty thousand, twenty-four".