21130303220 has 72 divisors (see below), whose sum is σ = 48767239584. Its totient is φ = 7685428608.

The previous prime is 21130303219. The next prime is 21130303253. The reversal of 21130303220 is 2230303112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 179807 + ... + 273113.

It is an arithmetic number, because the mean of its divisors is an integer number (677322772).

Almost surely, 2^21130303220 is an apocalyptic number.

21130303220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21130303220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24383619792).

21130303220 is an abundant number, since it is smaller than the sum of its proper divisors (27636936364).

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

21130303220 is a wasteful number, since it uses less digits than its factorization.

21130303220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93409 (or 93394 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21130303220 its reverse (2230303112), we get a palindrome (23360606332).

The spelling of 21130303220 in words is "twenty-one billion, one hundred thirty million, three hundred three thousand, two hundred twenty".