20030310221 has 2 divisors, whose sum is σ = 20030310222. Its totient is φ = 20030310220.

The previous prime is 20030310199. The next prime is 20030310229. The reversal of 20030310221 is 12201303002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16387584196 + 3642726025 = 128014^2 + 60355^2 .

It is a cyclic number.

It is not a de Polignac number, because 20030310221 - 2¹⁰ = 20030309197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20030310196 and 20030310205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20030310229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10015155110 + 10015155111.

It is an arithmetic number, because the mean of its divisors is an integer number (10015155111).

Almost surely, 2^20030310221 is an apocalyptic number.

It is an amenable number.

20030310221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20030310221 is an equidigital number, since it uses as much as digits as its factorization.

20030310221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 20030310221 its reverse (12201303002), we get a palindrome (32231613223).

The spelling of 20030310221 in words is "twenty billion, thirty million, three hundred ten thousand, two hundred twenty-one".