20123122322321 has 2 divisors, whose sum is σ = 20123122322322. Its totient is φ = 20123122322320.

The previous prime is 20123122322293. The next prime is 20123122322323. The reversal of 20123122322321 is 12322322132102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17482107307921 + 2641015014400 = 4181161^2 + 1625120^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20123122322321 is a prime.

Together with 20123122322323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20123122322323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061561161160 + 10061561161161.

It is an arithmetic number, because the mean of its divisors is an integer number (10061561161161).

Almost surely, 2^{20123122322321} is an apocalyptic number.

It is an amenable number.

20123122322321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123122322321 is an equidigital number, since it uses as much as digits as its factorization.

20123122322321 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 26.

Adding to 20123122322321 its reverse (12322322132102), we get a palindrome (32445444454423).

The spelling of 20123122322321 in words is "twenty trillion, one hundred twenty-three billion, one hundred twenty-two million, three hundred twenty-two thousand, three hundred twenty-one".