2123121233 has 4 divisors (see below), whose sum is σ = 2196332340. Its totient is φ = 2049910128.

The previous prime is 2123121197. The next prime is 2123121241. The reversal of 2123121233 is 3321213212.

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 630612544 + 1492508689 = 25112^2 + 38633^2 .

It is a cyclic number.

It is not a de Polignac number, because 2123121233 - 2¹⁴ = 2123104849 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2123121263) 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, 36605510 + ... + 36605567.

It is an arithmetic number, because the mean of its divisors is an integer number (549083085).

Almost surely, 2^2123121233 is an apocalyptic number.

It is an amenable number.

2123121233 is a deficient number, since it is larger than the sum of its proper divisors (73211107).

2123121233 is an equidigital number, since it uses as much as digits as its factorization.

2123121233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73211106.

The product of its digits is 432, while the sum is 20.

The square root of 2123121233 is about 46077.3396910021. The cubic root of 2123121233 is about 1285.2617942790.

Adding to 2123121233 its reverse (3321213212), we get a palindrome (5444334445).

The spelling of 2123121233 in words is "two billion, one hundred twenty-three million, one hundred twenty-one thousand, two hundred thirty-three".