20320321121 has 2 divisors, whose sum is σ = 20320321122. Its totient is φ = 20320321120.

The previous prime is 20320321103. The next prime is 20320321123. The reversal of 20320321121 is 12112302302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17360961121 + 2959360000 = 131761^2 + 54400^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20320321121 is a prime.

Together with 20320321123, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20320321121.

It is not a weakly prime, because it can be changed into another prime (20320321123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160160560 + 10160160561.

It is an arithmetic number, because the mean of its divisors is an integer number (10160160561).

Almost surely, 2^20320321121 is an apocalyptic number.

It is an amenable number.

20320321121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20320321121 is an equidigital number, since it uses as much as digits as its factorization.

20320321121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20320321121 its reverse (12112302302), we get a palindrome (32432623423).

The spelling of 20320321121 in words is "twenty billion, three hundred twenty million, three hundred twenty-one thousand, one hundred twenty-one".