20244342221 has 2 divisors, whose sum is σ = 20244342222. Its totient is φ = 20244342220.

The previous prime is 20244342197. The next prime is 20244342247. The reversal of 20244342221 is 12224344202.

It is an a-pointer prime, because the next prime (20244342247) can be obtained adding 20244342221 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12074713225 + 8169628996 = 109885^2 + 90386^2 .

It is a cyclic number.

It is not a de Polignac number, because 20244342221 - 2¹⁰ = 20244341197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20244342721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10122171110 + 10122171111.

It is an arithmetic number, because the mean of its divisors is an integer number (10122171111).

Almost surely, 2^20244342221 is an apocalyptic number.

It is an amenable number.

20244342221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20244342221 is an equidigital number, since it uses as much as digits as its factorization.

20244342221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6144, while the sum is 26.

Adding to 20244342221 its reverse (12224344202), we get a palindrome (32468686423).

The spelling of 20244342221 in words is "twenty billion, two hundred forty-four million, three hundred forty-two thousand, two hundred twenty-one".