21331130220 has 96 divisors (see below), whose sum is σ = 67488422400. Its totient is φ = 5591881152.

The previous prime is 21331130207. The next prime is 21331130257. The reversal of 21331130220 is 2203113312.

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 = 21331130193 and 21331130202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 302904 + ... + 366623.

It is an arithmetic number, because the mean of its divisors is an integer number (703004400).

Almost surely, 2^21331130220 is an apocalyptic number.

21331130220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21331130220 is an abundant number, since it is smaller than the sum of its proper divisors (46157292180).

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

21331130220 is a wasteful number, since it uses less digits than its factorization.

21331130220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669604 (or 669596 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21331130220 its reverse (2203113312), we get a palindrome (23534243532).

The spelling of 21331130220 in words is "twenty-one billion, three hundred thirty-one million, one hundred thirty thousand, two hundred twenty".