21020130304 has 44 divisors (see below), whose sum is σ = 42196039200. Its totient is φ = 10465968128.

The previous prime is 21020130253. The next prime is 21020130337. The reversal of 21020130304 is 40303102012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201792 + ... + 287680.

Almost surely, 2^21020130304 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21020130304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21098019600).

21020130304 is an abundant number, since it is smaller than the sum of its proper divisors (21175908896).

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

21020130304 is an equidigital number, since it uses as much as digits as its factorization.

21020130304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86148 (or 86130 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21020130304 its reverse (40303102012), we get a palindrome (61323232316).

The spelling of 21020130304 in words is "twenty-one billion, twenty million, one hundred thirty thousand, three hundred four".