2121212211 has 4 divisors (see below), whose sum is σ = 2828282952. Its totient is φ = 1414141472.

The previous prime is 2121212209. The next prime is 2121212263. The reversal of 2121212211 is 1122121212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2121212211 - 2¹ = 2121212209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2121212011) 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, 353535366 + ... + 353535371.

It is an arithmetic number, because the mean of its divisors is an integer number (707070738).

Almost surely, 2^2121212211 is an apocalyptic number.

2121212211 is a deficient number, since it is larger than the sum of its proper divisors (707070741).

2121212211 is an equidigital number, since it uses as much as digits as its factorization.

2121212211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707070740.

The product of its digits is 32, while the sum is 15.

The square root of 2121212211 is about 46056.6196219393. The cubic root of 2121212211 is about 1284.8764608431.

Adding to 2121212211 its reverse (1122121212), we get a palindrome (3243333423).

Subtracting from 2121212211 its reverse (1122121212), we obtain a palindrome (999090999).

The spelling of 2121212211 in words is "two billion, one hundred twenty-one million, two hundred twelve thousand, two hundred eleven".