20310121056611 has 2 divisors, whose sum is σ = 20310121056612. Its totient is φ = 20310121056610.

The previous prime is 20310121056607. The next prime is 20310121056613. The reversal of 20310121056611 is 11665012101302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20310121056611 - 2² = 20310121056607 is a prime.

Together with 20310121056613, 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 (20310121056613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10155060528305 + 10155060528306.

It is an arithmetic number, because the mean of its divisors is an integer number (10155060528306).

Almost surely, 2^{20310121056611} is an apocalyptic number.

20310121056611 is a deficient number, since it is larger than the sum of its proper divisors (1).

20310121056611 is an equidigital number, since it uses as much as digits as its factorization.

20310121056611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 29.

Adding to 20310121056611 its reverse (11665012101302), we get a palindrome (31975133157913).

The spelling of 20310121056611 in words is "twenty trillion, three hundred ten billion, one hundred twenty-one million, fifty-six thousand, six hundred eleven".