20321311289 has 2 divisors, whose sum is σ = 20321311290. Its totient is φ = 20321311288.

The previous prime is 20321311277. The next prime is 20321311337. The reversal of 20321311289 is 98211312302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19632773689 + 688537600 = 140117^2 + 26240^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20321311289 is a prime.

It is not a weakly prime, because it can be changed into another prime (20321311249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160655644 + 10160655645.

It is an arithmetic number, because the mean of its divisors is an integer number (10160655645).

Almost surely, 2^20321311289 is an apocalyptic number.

It is an amenable number.

20321311289 is a deficient number, since it is larger than the sum of its proper divisors (1).

20321311289 is an equidigital number, since it uses as much as digits as its factorization.

20321311289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The spelling of 20321311289 in words is "twenty billion, three hundred twenty-one million, three hundred eleven thousand, two hundred eighty-nine".