21232330220 has 12 divisors (see below), whose sum is σ = 44587893504. Its totient is φ = 8492932080.

The previous prime is 21232330219. The next prime is 21232330243. The reversal of 21232330220 is 2203323212.

It is a super-2 number, since 2×21232330220² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1061616511 = 21232330220 / (2 + 1 + 2 + 3 + 2 + 3 + 3 + 0 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 21232330192 and 21232330201.

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 3 ways as a sum of consecutive naturals, for example, 530808236 + ... + 530808275.

It is an arithmetic number, because the mean of its divisors is an integer number (3715657792).

Almost surely, 2^21232330220 is an apocalyptic number.

21232330220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21232330220 is an abundant number, since it is smaller than the sum of its proper divisors (23355563284).

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

21232330220 is a wasteful number, since it uses less digits than its factorization.

21232330220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1061616520 (or 1061616518 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 21232330220 its reverse (2203323212), we get a palindrome (23435653432).

The spelling of 21232330220 in words is "twenty-one billion, two hundred thirty-two million, three hundred thirty thousand, two hundred twenty".