20310121056653 has 2 divisors, whose sum is σ = 20310121056654. Its totient is φ = 20310121056652.

The previous prime is 20310121056613. The next prime is 20310121056683. The reversal of 20310121056653 is 35665012101302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12748484532004 + 7561636524649 = 3570502^2 + 2749843^2 .

It is a cyclic number.

It is not a de Polignac number, because 20310121056653 - 2²⁸ = 20309852621197 is a prime.

It is a congruent number.

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, 10155060528326 + 10155060528327.

It is an arithmetic number, because the mean of its divisors is an integer number (10155060528327).

Almost surely, 2^{20310121056653} is an apocalyptic number.

It is an amenable number.

20310121056653 is a deficient number, since it is larger than the sum of its proper divisors (1).

20310121056653 is an equidigital number, since it uses as much as digits as its factorization.

20310121056653 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 35.

Adding to 20310121056653 its reverse (35665012101302), we get a palindrome (55975133157955).

The spelling of 20310121056653 in words is "twenty trillion, three hundred ten billion, one hundred twenty-one million, fifty-six thousand, six hundred fifty-three".