2121133211 has 4 divisors (see below), whose sum is σ = 2124412272. Its totient is φ = 2117854152.

The previous prime is 2121133207. The next prime is 2121133247. The reversal of 2121133211 is 1123311212.

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 2121133211 - 2² = 2121133207 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121133211.

It is not an unprimeable number, because it can be changed into a prime (2121133291) 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, 1638560 + ... + 1639853.

It is an arithmetic number, because the mean of its divisors is an integer number (531103068).

Almost surely, 2^2121133211 is an apocalyptic number.

2121133211 is a deficient number, since it is larger than the sum of its proper divisors (3279061).

2121133211 is an equidigital number, since it uses as much as digits as its factorization.

2121133211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3279060.

The product of its digits is 72, while the sum is 17.

The square root of 2121133211 is about 46055.7619739376. The cubic root of 2121133211 is about 1284.8605098223.

Adding to 2121133211 its reverse (1123311212), we get a palindrome (3244444423).

The spelling of 2121133211 in words is "two billion, one hundred twenty-one million, one hundred thirty-three thousand, two hundred eleven".