2121122233 has 4 divisors (see below), whose sum is σ = 2140582180. Its totient is φ = 2101662288.

The previous prime is 2121122221. The next prime is 2121122243. The reversal of 2121122233 is 3322211212.

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 1931426704 + 189695529 = 43948^2 + 13773^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121122233 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 2121122233.

It is not an unprimeable number, because it can be changed into a prime (2121122243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9729810 + ... + 9730027.

It is an arithmetic number, because the mean of its divisors is an integer number (535145545).

Almost surely, 2^2121122233 is an apocalyptic number.

It is an amenable number.

2121122233 is a deficient number, since it is larger than the sum of its proper divisors (19459947).

2121122233 is a wasteful number, since it uses less digits than its factorization.

2121122233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19459946.

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

The square root of 2121122233 is about 46055.6427921704. The cubic root of 2121122233 is about 1284.8582932048.

Adding to 2121122233 its reverse (3322211212), we get a palindrome (5443333445).

The spelling of 2121122233 in words is "two billion, one hundred twenty-one million, one hundred twenty-two thousand, two hundred thirty-three".