2120002121 has 4 divisors (see below), whose sum is σ = 2231581200. Its totient is φ = 2008423044.

The previous prime is 2120002103. The next prime is 2120002133. The reversal of 2120002121 is 1212000212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2120002121 - 2⁶ = 2120002057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2120002321) 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 3 ways as a sum of consecutive naturals, for example, 55789511 + ... + 55789548.

It is an arithmetic number, because the mean of its divisors is an integer number (557895300).

Almost surely, 2^2120002121 is an apocalyptic number.

It is an amenable number.

2120002121 is a deficient number, since it is larger than the sum of its proper divisors (111579079).

2120002121 is a wasteful number, since it uses less digits than its factorization.

2120002121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111579078.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 2120002121 is about 46043.4807654678. The cubic root of 2120002121 is about 1284.6320861249.

Adding to 2120002121 its reverse (1212000212), we get a palindrome (3332002333).

The spelling of 2120002121 in words is "two billion, one hundred twenty million, two thousand, one hundred twenty-one".