21230301220 has 36 divisors (see below), whose sum is σ = 44907503004. Its totient is φ = 8430872640.

The previous prime is 21230301193. The next prime is 21230301221. The reversal of 21230301220 is 2210303212.

It can be written as a sum of positive squares in 2 ways, for example, as 12865003776 + 8365297444 = 113424^2 + 91462^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21230301194 and 21230301203.

It is not an unprimeable number, because it can be changed into a prime (21230301221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 358950 + ... + 413890.

It is an arithmetic number, because the mean of its divisors is an integer number (1247430639).

Almost surely, 2^21230301220 is an apocalyptic number.

21230301220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21230301220 is an abundant number, since it is smaller than the sum of its proper divisors (23677201784).

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

21230301220 is a wasteful number, since it uses less digits than its factorization.

21230301220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55228 (or 55087 counting only the distinct ones).

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

Adding to 21230301220 its reverse (2210303212), we get a palindrome (23440604432).

The spelling of 21230301220 in words is "twenty-one billion, two hundred thirty million, three hundred one thousand, two hundred twenty".