2121313013 has 4 divisors (see below), whose sum is σ = 2121561900. Its totient is φ = 2121064128.

The previous prime is 2121313001. The next prime is 2121313037. The reversal of 2121313013 is 3103131212.

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 1922559409 + 198753604 = 43847^2 + 14098^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121313013 - 2²⁶ = 2054204149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121312982 and 2121313000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121313813) 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, 111188 + ... + 128861.

It is an arithmetic number, because the mean of its divisors is an integer number (530390475).

Almost surely, 2^2121313013 is an apocalyptic number.

It is an amenable number.

2121313013 is a deficient number, since it is larger than the sum of its proper divisors (248887).

2121313013 is an equidigital number, since it uses as much as digits as its factorization.

2121313013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248886.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 2121313013 is about 46057.7139358870. The cubic root of 2121313013 is about 1284.8968133669.

Adding to 2121313013 its reverse (3103131212), we get a palindrome (5224444225).

The spelling of 2121313013 in words is "two billion, one hundred twenty-one million, three hundred thirteen thousand, thirteen".