11123133112121 has 4 divisors (see below), whose sum is σ = 11305479556644. Its totient is φ = 10940786667600.

The previous prime is 11123133112111. The next prime is 11123133112123. The reversal of 11123133112121 is 12121133132111.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4968169065721 + 6154964046400 = 2228939^2 + 2480920^2 .

It is a cyclic number.

It is not a de Polignac number, because 11123133112121 - 2⁶ = 11123133112057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11123133112123) 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, 91173222170 + ... + 91173222291.

It is an arithmetic number, because the mean of its divisors is an integer number (2826369889161).

Almost surely, 2^{11123133112121} is an apocalyptic number.

It is an amenable number.

11123133112121 is a deficient number, since it is larger than the sum of its proper divisors (182346444523).

11123133112121 is an equidigital number, since it uses as much as digits as its factorization.

11123133112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182346444522.

The product of its digits is 216, while the sum is 23.

Adding to 11123133112121 its reverse (12121133132111), we get a palindrome (23244266244232).

The spelling of 11123133112121 in words is "eleven trillion, one hundred twenty-three billion, one hundred thirty-three million, one hundred twelve thousand, one hundred twenty-one".