20205221489 has 2 divisors, whose sum is σ = 20205221490. Its totient is φ = 20205221488.

The previous prime is 20205221461. The next prime is 20205221513. The reversal of 20205221489 is 98412250202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12665251600 + 7539969889 = 112540^2 + 86833^2 .

It is a cyclic number.

It is not a de Polignac number, because 20205221489 - 2⁸ = 20205221233 is a prime.

It is not a weakly prime, because it can be changed into another prime (20205221459) 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, 10102610744 + 10102610745.

It is an arithmetic number, because the mean of its divisors is an integer number (10102610745).

Almost surely, 2^20205221489 is an apocalyptic number.

It is an amenable number.

20205221489 is a deficient number, since it is larger than the sum of its proper divisors (1).

20205221489 is an equidigital number, since it uses as much as digits as its factorization.

20205221489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 35.

The spelling of 20205221489 in words is "twenty billion, two hundred five million, two hundred twenty-one thousand, four hundred eighty-nine".