2121340223 has 4 divisors (see below), whose sum is σ = 2246124960. Its totient is φ = 1996555488.

The previous prime is 2121340213. The next prime is 2121340241. The reversal of 2121340223 is 3220431212.

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

It is a cyclic number.

It is not a de Polignac number, because 2121340223 - 2⁸ = 2121339967 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121340195 and 2121340204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121340213) 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, 62392343 + ... + 62392376.

It is an arithmetic number, because the mean of its divisors is an integer number (561531240).

Almost surely, 2^2121340223 is an apocalyptic number.

2121340223 is a deficient number, since it is larger than the sum of its proper divisors (124784737).

2121340223 is a wasteful number, since it uses less digits than its factorization.

2121340223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124784736.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 2121340223 is about 46058.0093251977. The cubic root of 2121340223 is about 1284.9023071173.

Adding to 2121340223 its reverse (3220431212), we get a palindrome (5341771435).

The spelling of 2121340223 in words is "two billion, one hundred twenty-one million, three hundred forty thousand, two hundred twenty-three".