30321220221 has 6 divisors (see below), whose sum is σ = 43797318110. Its totient is φ = 20214146808.

The previous prime is 30321220199. The next prime is 30321220271. The reversal of 30321220221 is 12202212303.

It can be written as a sum of positive squares in only one way, i.e., 24382822500 + 5938397721 = 156150^2 + 77061^2 .

It is not a de Polignac number, because 30321220221 - 2⁶ = 30321220157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30321220194 and 30321220203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30321220271) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 1684512226 + ... + 1684512243.

Almost surely, 2^30321220221 is an apocalyptic number.

It is an amenable number.

30321220221 is a deficient number, since it is larger than the sum of its proper divisors (13476097889).

30321220221 is a wasteful number, since it uses less digits than its factorization.

30321220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3369024475 (or 3369024472 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 30321220221 its reverse (12202212303), we get a palindrome (42523432524).

The spelling of 30321220221 in words is "thirty billion, three hundred twenty-one million, two hundred twenty thousand, two hundred twenty-one".