20221220989 has 2 divisors, whose sum is σ = 20221220990. Its totient is φ = 20221220988.

The previous prime is 20221220947. The next prime is 20221221049. The reversal of 20221220989 is 98902212202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10561672900 + 9659548089 = 102770^2 + 98283^2 .

It is a cyclic number.

It is not a de Polignac number, because 20221220989 - 2¹⁹ = 20220696701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20221220909) 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, 10110610494 + 10110610495.

It is an arithmetic number, because the mean of its divisors is an integer number (10110610495).

Almost surely, 2^20221220989 is an apocalyptic number.

It is an amenable number.

20221220989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20221220989 is an equidigital number, since it uses as much as digits as its factorization.

20221220989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 37.

The spelling of 20221220989 in words is "twenty billion, two hundred twenty-one million, two hundred twenty thousand, nine hundred eighty-nine".