20303333221 has 2 divisors, whose sum is σ = 20303333222. Its totient is φ = 20303333220.

The previous prime is 20303333213. The next prime is 20303333233. The reversal of 20303333221 is 12233330302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18684156100 + 1619177121 = 136690^2 + 40239^2 .

It is a cyclic number.

It is not a de Polignac number, because 20303333221 - 2³ = 20303333213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20303333192 and 20303333201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20303333251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10151666610 + 10151666611.

It is an arithmetic number, because the mean of its divisors is an integer number (10151666611).

Almost surely, 2^20303333221 is an apocalyptic number.

It is an amenable number.

20303333221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20303333221 is an equidigital number, since it uses as much as digits as its factorization.

20303333221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 22.

Adding to 20303333221 its reverse (12233330302), we get a palindrome (32536663523).

The spelling of 20303333221 in words is "twenty billion, three hundred three million, three hundred thirty-three thousand, two hundred twenty-one".