20331300221 has 2 divisors, whose sum is σ = 20331300222. Its totient is φ = 20331300220.

The previous prime is 20331300181. The next prime is 20331300259. The reversal of 20331300221 is 12200313302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10897063321 + 9434236900 = 104389^2 + 97130^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20331300221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20331300221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20331305221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10165650110 + 10165650111.

It is an arithmetic number, because the mean of its divisors is an integer number (10165650111).

Almost surely, 2^20331300221 is an apocalyptic number.

It is an amenable number.

20331300221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20331300221 is an equidigital number, since it uses as much as digits as its factorization.

20331300221 is an odious number, because the sum of its binary digits is odd.

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

Adding to 20331300221 its reverse (12200313302), we get a palindrome (32531613523).

The spelling of 20331300221 in words is "twenty billion, three hundred thirty-one million, three hundred thousand, two hundred twenty-one".