20121110123 has 4 divisors (see below), whose sum is σ = 20129006400. Its totient is φ = 20113213848.

The previous prime is 20121110117. The next prime is 20121110131. The reversal of 20121110123 is 32101112102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32101112102 = 2 ⋅16050556051.

It is a cyclic number.

It is not a de Polignac number, because 20121110123 - 2¹⁴ = 20121093739 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20121110098 and 20121110107.

It is not an unprimeable number, because it can be changed into a prime (20121110623) 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, 3944315 + ... + 3949412.

It is an arithmetic number, because the mean of its divisors is an integer number (5032251600).

Almost surely, 2^20121110123 is an apocalyptic number.

20121110123 is a deficient number, since it is larger than the sum of its proper divisors (7896277).

20121110123 is an equidigital number, since it uses as much as digits as its factorization.

20121110123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7896276.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 20121110123 its reverse (32101112102), we get a palindrome (52222222225).

The spelling of 20121110123 in words is "twenty billion, one hundred twenty-one million, one hundred ten thousand, one hundred twenty-three".