2121110123 has 4 divisors (see below), whose sum is σ = 2313938328. Its totient is φ = 1928281920.

The previous prime is 2121110059. The next prime is 2121110129. The reversal of 2121110123 is 3210111212.

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 2121110123 - 2⁶ = 2121110059 is a prime.

It is a super-3 number, since 3×2121110123³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121110098 and 2121110107.

It is not an unprimeable number, because it can be changed into a prime (2121110129) 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, 96414086 + ... + 96414107.

It is an arithmetic number, because the mean of its divisors is an integer number (578484582).

Almost surely, 2^2121110123 is an apocalyptic number.

2121110123 is a deficient number, since it is larger than the sum of its proper divisors (192828205).

2121110123 is a wasteful number, since it uses less digits than its factorization.

2121110123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192828204.

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

The square root of 2121110123 is about 46055.5113205792. The cubic root of 2121110123 is about 1284.8558480112.

Adding to 2121110123 its reverse (3210111212), we get a palindrome (5331221335).

The spelling of 2121110123 in words is "two billion, one hundred twenty-one million, one hundred ten thousand, one hundred twenty-three".