21330030221 has 6 divisors (see below), whose sum is σ = 22040292366. Its totient is φ = 20641963800.

The previous prime is 21330030193. The next prime is 21330030223. The reversal of 21330030221 is 12203003312.

It can be written as a sum of positive squares in only one way, i.e., 16272829225 + 5057200996 = 127565^2 + 71114^2 .

It is not a de Polignac number, because 21330030221 - 2⁶ = 21330030157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21330030221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330030223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11096870 + ... + 11098791.

It is an arithmetic number, because the mean of its divisors is an integer number (3673382061).

Almost surely, 2^21330030221 is an apocalyptic number.

It is an amenable number.

21330030221 is a deficient number, since it is larger than the sum of its proper divisors (710262145).

21330030221 is an equidigital number, since it uses as much as digits as its factorization.

21330030221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22195723 (or 22195692 counting only the distinct ones).

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

Adding to 21330030221 its reverse (12203003312), we get a palindrome (33533033533).

The spelling of 21330030221 in words is "twenty-one billion, three hundred thirty million, thirty thousand, two hundred twenty-one".