20202212221 has 2 divisors, whose sum is σ = 20202212222. Its totient is φ = 20202212220.

The previous prime is 20202212197. The next prime is 20202212237. The reversal of 20202212221 is 12221220202.

It is an a-pointer prime, because the next prime (20202212237) can be obtained adding 20202212221 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16648740900 + 3553471321 = 129030^2 + 59611^2 .

It is a cyclic number.

It is not a de Polignac number, because 20202212221 - 2⁹ = 20202211709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20202212195 and 20202212204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20202212281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10101106110 + 10101106111.

It is an arithmetic number, because the mean of its divisors is an integer number (10101106111).

Almost surely, 2^20202212221 is an apocalyptic number.

It is an amenable number.

20202212221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20202212221 is an equidigital number, since it uses as much as digits as its factorization.

20202212221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 20202212221 its reverse (12221220202), we get a palindrome (32423432423).

The spelling of 20202212221 in words is "twenty billion, two hundred two million, two hundred twelve thousand, two hundred twenty-one".