20002220010221 has 2 divisors, whose sum is σ = 20002220010222. Its totient is φ = 20002220010220.

The previous prime is 20002220010197. The next prime is 20002220010301. The reversal of 20002220010221 is 12201002220002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18888802515625 + 1113417494596 = 4346125^2 + 1055186^2 .

It is a cyclic number.

It is not a de Polignac number, because 20002220010221 - 2¹⁰ = 20002220009197 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 = 20002220010196 and 20002220010205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20002220010121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001110005110 + 10001110005111.

It is an arithmetic number, because the mean of its divisors is an integer number (10001110005111).

Almost surely, 2^{20002220010221} is an apocalyptic number.

It is an amenable number.

20002220010221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20002220010221 is an equidigital number, since it uses as much as digits as its factorization.

20002220010221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 20002220010221 its reverse (12201002220002), we get a palindrome (32203222230223).

The spelling of 20002220010221 in words is "twenty trillion, two billion, two hundred twenty million, ten thousand, two hundred twenty-one".