21243010320 has 160 divisors (see below), whose sum is σ = 83623338240. Its totient is φ = 4855541760.

The previous prime is 21243010279. The next prime is 21243010333. The reversal of 21243010320 is 2301034212.

21243010320 is a `hidden beast` number, since 21 + 24 + 301 + 0 + 320 = 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 = 21243010293 and 21243010302.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 687361 + ... + 717600.

It is an arithmetic number, because the mean of its divisors is an integer number (522645864).

Almost surely, 2^21243010320 is an apocalyptic number.

21243010320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21243010320 is an abundant number, since it is smaller than the sum of its proper divisors (62380327920).

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

21243010320 is a wasteful number, since it uses less digits than its factorization.

21243010320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1404990 (or 1404978 counting only the distinct ones).

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

Adding to 21243010320 its reverse (2301034212), we get a palindrome (23544044532).

The spelling of 21243010320 in words is "twenty-one billion, two hundred forty-three million, ten thousand, three hundred twenty".