21303110220 has 96 divisors (see below), whose sum is σ = 68219010048. Its totient is φ = 4865778432.

The previous prime is 21303110219. The next prime is 21303110237. The reversal of 21303110220 is 2201130312.

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 21303110220.

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, 590214 + ... + 625266.

It is an arithmetic number, because the mean of its divisors is an integer number (710614688).

Almost surely, 2^21303110220 is an apocalyptic number.

21303110220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21303110220 is an abundant number, since it is smaller than the sum of its proper divisors (46915899828).

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

21303110220 is a wasteful number, since it uses less digits than its factorization.

21303110220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36519 (or 36517 counting only the distinct ones).

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

Adding to 21303110220 its reverse (2201130312), we get a palindrome (23504240532).

The spelling of 21303110220 in words is "twenty-one billion, three hundred three million, one hundred ten thousand, two hundred twenty".