20332220221 has 2 divisors, whose sum is σ = 20332220222. Its totient is φ = 20332220220.

The previous prime is 20332220203. The next prime is 20332220231. The reversal of 20332220221 is 12202223302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16202744100 + 4129476121 = 127290^2 + 64261^2 .

It is a cyclic number.

It is not a de Polignac number, because 20332220221 - 2⁹ = 20332219709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20332220231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10166110110 + 10166110111.

It is an arithmetic number, because the mean of its divisors is an integer number (10166110111).

Almost surely, 2^20332220221 is an apocalyptic number.

It is an amenable number.

20332220221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20332220221 is an equidigital number, since it uses as much as digits as its factorization.

20332220221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 20332220221 its reverse (12202223302), we get a palindrome (32534443523).

The spelling of 20332220221 in words is "twenty billion, three hundred thirty-two million, two hundred twenty thousand, two hundred twenty-one".