2121212233 has 4 divisors (see below), whose sum is σ = 2424242560. Its totient is φ = 1818181908.

The previous prime is 2121212209. The next prime is 2121212263. The reversal of 2121212233 is 3322121212.

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 2121212233 - 2⁹ = 2121211721 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121212233.

It is not an unprimeable number, because it can be changed into a prime (2121212263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151515153 + ... + 151515166.

It is an arithmetic number, because the mean of its divisors is an integer number (606060640).

Almost surely, 2^2121212233 is an apocalyptic number.

It is an amenable number.

2121212233 is a deficient number, since it is larger than the sum of its proper divisors (303030327).

2121212233 is an equidigital number, since it uses as much as digits as its factorization.

2121212233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303030326.

The product of its digits is 288, while the sum is 19.

The square root of 2121212233 is about 46056.6198607757. The cubic root of 2121212233 is about 1284.8764652851.

Adding to 2121212233 its reverse (3322121212), we get a palindrome (5443333445).

The spelling of 2121212233 in words is "two billion, one hundred twenty-one million, two hundred twelve thousand, two hundred thirty-three".