20123133121123 has 2 divisors, whose sum is σ = 20123133121124. Its totient is φ = 20123133121122.

The previous prime is 20123133121087. The next prime is 20123133121193. The reversal of 20123133121123 is 32112133132102.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20123133121123 is a prime.

It is a super-2 number, since 2×20123133121123² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20123133121193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061566560561 + 10061566560562.

It is an arithmetic number, because the mean of its divisors is an integer number (10061566560562).

Almost surely, 2^{20123133121123} is an apocalyptic number.

20123133121123 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123133121123 is an equidigital number, since it uses as much as digits as its factorization.

20123133121123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 20123133121123 its reverse (32112133132102), we get a palindrome (52235266253225).

The spelling of 20123133121123 in words is "twenty trillion, one hundred twenty-three billion, one hundred thirty-three million, one hundred twenty-one thousand, one hundred twenty-three".