2121232313 has 4 divisors (see below), whose sum is σ = 2132223348. Its totient is φ = 2110241280.

The previous prime is 2121232291. The next prime is 2121232331. The reversal of 2121232313 is 3132321212.

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 420742144 + 1700490169 = 20512^2 + 41237^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121232313 - 2¹⁰ = 2121231289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121232213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5495228 + ... + 5495613.

It is an arithmetic number, because the mean of its divisors is an integer number (533055837).

Almost surely, 2^2121232313 is an apocalyptic number.

It is an amenable number.

2121232313 is a deficient number, since it is larger than the sum of its proper divisors (10991035).

2121232313 is a wasteful number, since it uses less digits than its factorization.

2121232313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10991034.

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

The square root of 2121232313 is about 46056.8378528097. The cubic root of 2121232313 is about 1284.8805196080.

Adding to 2121232313 its reverse (3132321212), we get a palindrome (5253553525).

The spelling of 2121232313 in words is "two billion, one hundred twenty-one million, two hundred thirty-two thousand, three hundred thirteen".