20213220102221 has 2 divisors, whose sum is σ = 20213220102222. Its totient is φ = 20213220102220.

The previous prime is 20213220102209. The next prime is 20213220102277. The reversal of 20213220102221 is 12220102231202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11480373592900 + 8732846509321 = 3388270^2 + 2955139^2 .

It is a cyclic number.

It is not a de Polignac number, because 20213220102221 - 2¹⁴ = 20213220085837 is a prime.

It is a super-2 number, since 2×20213220102221² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20213220102193 and 20213220102202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20213120102221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106610051110 + 10106610051111.

It is an arithmetic number, because the mean of its divisors is an integer number (10106610051111).

Almost surely, 2^{20213220102221} is an apocalyptic number.

It is an amenable number.

20213220102221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20213220102221 is an equidigital number, since it uses as much as digits as its factorization.

20213220102221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 20213220102221 its reverse (12220102231202), we get a palindrome (32433322333423).

The spelling of 20213220102221 in words is "twenty trillion, two hundred thirteen billion, two hundred twenty million, one hundred two thousand, two hundred twenty-one".