2120340121 has 2 divisors, whose sum is σ = 2120340122. Its totient is φ = 2120340120.

The previous prime is 2120340119. The next prime is 2120340137. The reversal of 2120340121 is 1210430212.

It is an a-pointer prime, because the next prime (2120340137) can be obtained adding 2120340121 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1172377600 + 947962521 = 34240^2 + 30789^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120340121 - 2¹ = 2120340119 is a prime.

Together with 2120340119, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 2120340095 and 2120340104.

It is not a weakly prime, because it can be changed into another prime (2120340151) 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, 1060170060 + 1060170061.

It is an arithmetic number, because the mean of its divisors is an integer number (1060170061).

Almost surely, 2^2120340121 is an apocalyptic number.

It is an amenable number.

2120340121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120340121 is an equidigital number, since it uses as much as digits as its factorization.

2120340121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2120340121 is about 46047.1510627965. The cubic root of 2120340121 is about 1284.7003537565.

Adding to 2120340121 its reverse (1210430212), we get a palindrome (3330770333).

Subtracting from 2120340121 its reverse (1210430212), we obtain a palindrome (909909909).

The spelling of 2120340121 in words is "two billion, one hundred twenty million, three hundred forty thousand, one hundred twenty-one".