2121021313 has 2 divisors, whose sum is σ = 2121021314. Its totient is φ = 2121021312.

The previous prime is 2121021293. The next prime is 2121021361. The reversal of 2121021313 is 3131201212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1287948544 + 833072769 = 35888^2 + 28863^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121021313 - 2⁹ = 2121020801 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121021013) 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 as a sum of consecutive naturals, namely, 1060510656 + 1060510657.

It is an arithmetic number, because the mean of its divisors is an integer number (1060510657).

Almost surely, 2^2121021313 is an apocalyptic number.

It is an amenable number.

2121021313 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121021313 is an equidigital number, since it uses as much as digits as its factorization.

2121021313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 2121021313 is about 46054.5471479201. The cubic root of 2121021313 is about 1284.8379156340.

Adding to 2121021313 its reverse (3131201212), we get a palindrome (5252222525).

The spelling of 2121021313 in words is "two billion, one hundred twenty-one million, twenty-one thousand, three hundred thirteen".