20121230123 has 4 divisors (see below), whose sum is σ = 20121867648. Its totient is φ = 20120592600.

The previous prime is 20121230119. The next prime is 20121230177. The reversal of 20121230123 is 32103212102.

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

It is a cyclic number.

It is not a de Polignac number, because 20121230123 - 2² = 20121230119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20121239123) 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 in 3 ways as a sum of consecutive naturals, for example, 268811 + ... + 335412.

It is an arithmetic number, because the mean of its divisors is an integer number (5030466912).

Almost surely, 2^20121230123 is an apocalyptic number.

20121230123 is a deficient number, since it is larger than the sum of its proper divisors (637525).

20121230123 is an equidigital number, since it uses as much as digits as its factorization.

20121230123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637524.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20121230123 its reverse (32103212102), we get a palindrome (52224442225).

The spelling of 20121230123 in words is "twenty billion, one hundred twenty-one million, two hundred thirty thousand, one hundred twenty-three".