20303022221 has 2 divisors, whose sum is σ = 20303022222. Its totient is φ = 20303022220.

The previous prime is 20303022217. The next prime is 20303022253. The reversal of 20303022221 is 12222030302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10504200100 + 9798822121 = 102490^2 + 98989^2 .

It is a cyclic number.

It is not a de Polignac number, because 20303022221 - 2² = 20303022217 is a prime.

It is a super-2 number, since 2×20303022221² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20303022221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20303022281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10151511110 + 10151511111.

It is an arithmetic number, because the mean of its divisors is an integer number (10151511111).

Almost surely, 2^20303022221 is an apocalyptic number.

It is an amenable number.

20303022221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20303022221 is an equidigital number, since it uses as much as digits as its factorization.

20303022221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 20303022221 its reverse (12222030302), we get a palindrome (32525052523).

The spelling of 20303022221 in words is "twenty billion, three hundred three million, twenty-two thousand, two hundred twenty-one".