21321030120 has 128 divisors (see below), whose sum is σ = 72508867200. Its totient is φ = 4972022784.

The previous prime is 21321030079. The next prime is 21321030167. The reversal of 21321030120 is 2103012312.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21321030120.

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 31 ways as a sum of consecutive naturals, for example, 330027 + ... + 389306.

It is an arithmetic number, because the mean of its divisors is an integer number (566475525).

Almost surely, 2^21321030120 is an apocalyptic number.

21321030120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21321030120 is an abundant number, since it is smaller than the sum of its proper divisors (51187837080).

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

21321030120 is a wasteful number, since it uses less digits than its factorization.

21321030120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719379 (or 719375 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21321030120 its reverse (2103012312), we get a palindrome (23424042432).

The spelling of 21321030120 in words is "twenty-one billion, three hundred twenty-one million, thirty thousand, one hundred twenty".