21002320224 has 60 divisors (see below), whose sum is σ = 61767248004. Its totient is φ = 7000772544.

The previous prime is 21002320153. The next prime is 21002320243. The reversal of 21002320224 is 42202320012.

21002320224 is a `hidden beast` number, since 210 + 0 + 232 + 0 + 224 = 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 = 21002320197 and 21002320206.

It is a congruent number.

It is an unprimeable number.

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 9 ways as a sum of consecutive naturals, for example, 4048782 + ... + 4053965.

Almost surely, 2^21002320224 is an apocalyptic number.

21002320224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21002320224 is an abundant number, since it is smaller than the sum of its proper divisors (40764927780).

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

21002320224 is an equidigital number, since it uses as much as digits as its factorization.

21002320224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8102769 (or 8102752 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 21002320224 its reverse (42202320012), we get a palindrome (63204640236).

The spelling of 21002320224 in words is "twenty-one billion, two million, three hundred twenty thousand, two hundred twenty-four".