20213033210221 has 2 divisors, whose sum is σ = 20213033210222. Its totient is φ = 20213033210220.

The previous prime is 20213033210207. The next prime is 20213033210233. The reversal of 20213033210221 is 12201233031202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11444594276196 + 8768438934025 = 3382986^2 + 2961155^2 .

It is a cyclic number.

It is not a de Polignac number, because 20213033210221 - 2¹⁵ = 20213033177453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20213033210192 and 20213033210201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20213033210521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106516605110 + 10106516605111.

It is an arithmetic number, because the mean of its divisors is an integer number (10106516605111).

Almost surely, 2^{20213033210221} is an apocalyptic number.

It is an amenable number.

20213033210221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20213033210221 is an equidigital number, since it uses as much as digits as its factorization.

20213033210221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 20213033210221 its reverse (12201233031202), we get a palindrome (32414266241423).

The spelling of 20213033210221 in words is "twenty trillion, two hundred thirteen billion, thirty-three million, two hundred ten thousand, two hundred twenty-one".