2120312121 has 16 divisors (see below), whose sum is σ = 2944395648. Its totient is φ = 1355961600.

The previous prime is 2120312099. The next prime is 2120312123. The reversal of 2120312121 is 1212130212.

It is not a de Polignac number, because 2120312121 - 2⁶ = 2120312057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2120312121.

It is not an unprimeable number, because it can be changed into a prime (2120312123) 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 in 15 ways as a sum of consecutive naturals, for example, 126640 + ... + 142401.

It is an arithmetic number, because the mean of its divisors is an integer number (184024728).

Almost surely, 2^2120312121 is an apocalyptic number.

It is an amenable number.

2120312121 is a deficient number, since it is larger than the sum of its proper divisors (824083527).

2120312121 is a wasteful number, since it uses less digits than its factorization.

2120312121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269152.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 2120312121 is about 46046.8470256108. The cubic root of 2120312121 is about 1284.6946987253.

Adding to 2120312121 its reverse (1212130212), we get a palindrome (3332442333).

The spelling of 2120312121 in words is "two billion, one hundred twenty million, three hundred twelve thousand, one hundred twenty-one".