21222020089 has 2 divisors, whose sum is σ = 21222020090. Its totient is φ = 21222020088.

The previous prime is 21222020077. The next prime is 21222020117. The reversal of 21222020089 is 98002022212.

It is an a-pointer prime, because the next prime (21222020117) can be obtained adding 21222020089 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20024514064 + 1197506025 = 141508^2 + 34605^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222020089 - 2³³ = 12632085497 is a prime.

It is not a weakly prime, because it can be changed into another prime (21222020389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611010044 + 10611010045.

It is an arithmetic number, because the mean of its divisors is an integer number (10611010045).

Almost surely, 2^21222020089 is an apocalyptic number.

It is an amenable number.

21222020089 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222020089 is an equidigital number, since it uses as much as digits as its factorization.

21222020089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 28.

The spelling of 21222020089 in words is "twenty-one billion, two hundred twenty-two million, twenty thousand, eighty-nine".