20356363320121 has 2 divisors, whose sum is σ = 20356363320122. Its totient is φ = 20356363320120.

The previous prime is 20356363320119. The next prime is 20356363320131. The reversal of 20356363320121 is 12102336365302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19011030106896 + 1345333213225 = 4360164^2 + 1159885^2 .

It is a cyclic number.

It is not a de Polignac number, because 20356363320121 - 2¹ = 20356363320119 is a prime.

Together with 20356363320119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20356363320131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10178181660060 + 10178181660061.

It is an arithmetic number, because the mean of its divisors is an integer number (10178181660061).

Almost surely, 2^{20356363320121} is an apocalyptic number.

It is an amenable number.

20356363320121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20356363320121 is an equidigital number, since it uses as much as digits as its factorization.

20356363320121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 37.

Adding to 20356363320121 its reverse (12102336365302), we get a palindrome (32458699685423).

The spelling of 20356363320121 in words is "twenty trillion, three hundred fifty-six billion, three hundred sixty-three million, three hundred twenty thousand, one hundred twenty-one".