2133123121 has 4 divisors (see below), whose sum is σ = 2133256000. Its totient is φ = 2132990244.

The previous prime is 2133123107. The next prime is 2133123137. The reversal of 2133123121 is 1213213312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2133123121 - 2⁵ = 2133123089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2133123721) 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, 38421 + ... + 75778.

It is an arithmetic number, because the mean of its divisors is an integer number (533314000).

Almost surely, 2^2133123121 is an apocalyptic number.

It is an amenable number.

2133123121 is a deficient number, since it is larger than the sum of its proper divisors (132879).

2133123121 is a wasteful number, since it uses less digits than its factorization.

2133123121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132878.

The product of its digits is 216, while the sum is 19.

The square root of 2133123121 is about 46185.7458638485. The cubic root of 2133123121 is about 1287.2768952152.

Adding to 2133123121 its reverse (1213213312), we get a palindrome (3346336433).

The spelling of 2133123121 in words is "two billion, one hundred thirty-three million, one hundred twenty-three thousand, one hundred twenty-one".