20321122189 has 2 divisors, whose sum is σ = 20321122190. Its totient is φ = 20321122188.

The previous prime is 20321122187. The next prime is 20321122223. The reversal of 20321122189 is 98122112302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10719082089 + 9602040100 = 103533^2 + 97990^2 .

It is a cyclic number.

It is not a de Polignac number, because 20321122189 - 2¹ = 20321122187 is a prime.

Together with 20321122187, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20321122189.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20321122181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160561094 + 10160561095.

It is an arithmetic number, because the mean of its divisors is an integer number (10160561095).

Almost surely, 2^20321122189 is an apocalyptic number.

It is an amenable number.

20321122189 is a deficient number, since it is larger than the sum of its proper divisors (1).

20321122189 is an equidigital number, since it uses as much as digits as its factorization.

20321122189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 31.

The spelling of 20321122189 in words is "twenty billion, three hundred twenty-one million, one hundred twenty-two thousand, one hundred eighty-nine".