20310312123121 has 4 divisors (see below), whose sum is σ = 20310352909812. Its totient is φ = 20310271336432.

The previous prime is 20310312123119. The next prime is 20310312123131. The reversal of 20310312123121 is 12132121301302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11033956627600 + 9276355495521 = 3321740^2 + 3045711^2 .

It is a cyclic number.

It is not a de Polignac number, because 20310312123121 - 2¹ = 20310312123119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20310312123092 and 20310312123101.

It is not an unprimeable number, because it can be changed into a prime (20310312123131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19637050 + ... + 20645443.

It is an arithmetic number, because the mean of its divisors is an integer number (5077588227453).

Almost surely, 2^{20310312123121} is an apocalyptic number.

It is an amenable number.

20310312123121 is a deficient number, since it is larger than the sum of its proper divisors (40786691).

20310312123121 is an equidigital number, since it uses as much as digits as its factorization.

20310312123121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40786690.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 20310312123121 its reverse (12132121301302), we get a palindrome (32442433424423).

The spelling of 20310312123121 in words is "twenty trillion, three hundred ten billion, three hundred twelve million, one hundred twenty-three thousand, one hundred twenty-one".