20123121130103 has 2 divisors, whose sum is σ = 20123121130104. Its totient is φ = 20123121130102.

The previous prime is 20123121130043. The next prime is 20123121130247. The reversal of 20123121130103 is 30103112132102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20123121130103 - 2¹⁶ = 20123121064567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20123121130703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061560565051 + 10061560565052.

It is an arithmetic number, because the mean of its divisors is an integer number (10061560565052).

Almost surely, 2^{20123121130103} is an apocalyptic number.

20123121130103 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123121130103 is an equidigital number, since it uses as much as digits as its factorization.

20123121130103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 20123121130103 its reverse (30103112132102), we get a palindrome (50226233262205).

The spelling of 20123121130103 in words is "twenty trillion, one hundred twenty-three billion, one hundred twenty-one million, one hundred thirty thousand, one hundred three".