11123121023 has 4 divisors (see below), whose sum is σ = 12712138320. Its totient is φ = 9534103728.

The previous prime is 11123121007. The next prime is 11123121091. The reversal of 11123121023 is 32012132111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32012132111 = 61 ⋅524789051.

It is a cyclic number.

It is not a de Polignac number, because 11123121023 - 2⁴ = 11123121007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11123120992 and 11123121010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11123121323) 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, 794508638 + ... + 794508651.

It is an arithmetic number, because the mean of its divisors is an integer number (3178034580).

Almost surely, 2^11123121023 is an apocalyptic number.

11123121023 is a deficient number, since it is larger than the sum of its proper divisors (1589017297).

11123121023 is an equidigital number, since it uses as much as digits as its factorization.

11123121023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1589017296.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 11123121023 its reverse (32012132111), we get a palindrome (43135253134).

The spelling of 11123121023 in words is "eleven billion, one hundred twenty-three million, one hundred twenty-one thousand, twenty-three".