20310121056613 has 2 divisors, whose sum is σ = 20310121056614. Its totient is φ = 20310121056612.

The previous prime is 20310121056611. The next prime is 20310121056653. The reversal of 20310121056613 is 31665012101302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12890124839524 + 7419996217089 = 3590282^2 + 2723967^2 .

It is a cyclic number.

It is not a de Polignac number, because 20310121056613 - 2¹ = 20310121056611 is a prime.

Together with 20310121056611, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20310121056611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10155060528306 + 10155060528307.

It is an arithmetic number, because the mean of its divisors is an integer number (10155060528307).

Almost surely, 2^{20310121056613} is an apocalyptic number.

It is an amenable number.

20310121056613 is a deficient number, since it is larger than the sum of its proper divisors (1).

20310121056613 is an equidigital number, since it uses as much as digits as its factorization.

20310121056613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

Adding to 20310121056613 its reverse (31665012101302), we get a palindrome (51975133157915).

The spelling of 20310121056613 in words is "twenty trillion, three hundred ten billion, one hundred twenty-one million, fifty-six thousand, six hundred thirteen".