2121121121 has 4 divisors (see below), whose sum is σ = 2424138432. Its totient is φ = 1818103812.

The previous prime is 2121121117. The next prime is 2121121141. The reversal of 2121121121 is 1211211212.

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 2121121121 - 2² = 2121121117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121121096 and 2121121105.

It is not an unprimeable number, because it can be changed into a prime (2121121141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151508645 + ... + 151508658.

It is an arithmetic number, because the mean of its divisors is an integer number (606034608).

Almost surely, 2^2121121121 is an apocalyptic number.

It is an amenable number.

2121121121 is a deficient number, since it is larger than the sum of its proper divisors (303017311).

2121121121 is an equidigital number, since it uses as much as digits as its factorization.

2121121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303017310.

The product of its digits is 16, while the sum is 14.

The square root of 2121121121 is about 46055.6307198154. The cubic root of 2121121121 is about 1284.8580686754.

Adding to 2121121121 its reverse (1211211212), we get a palindrome (3332332333).

Subtracting from 2121121121 its reverse (1211211212), we obtain a palindrome (909909909).

It can be divided in two parts, 2 and 121121121, that multiplied together give a palindrome (242242242).

The spelling of 2121121121 in words is "two billion, one hundred twenty-one million, one hundred twenty-one thousand, one hundred twenty-one".