2121331211 has 4 divisors (see below), whose sum is σ = 2122268400. Its totient is φ = 2120394024.

The previous prime is 2121331207. The next prime is 2121331241. The reversal of 2121331211 is 1121331212.

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 2121331211 - 2² = 2121331207 is a prime.

It is a super-2 number, since 2×2121331211² = 9000092213525453042, which contains 22 as substring.

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 2121331211.

It is not an unprimeable number, because it can be changed into a prime (2121331241) 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, 465191 + ... + 469728.

It is an arithmetic number, because the mean of its divisors is an integer number (530567100).

Almost surely, 2^2121331211 is an apocalyptic number.

2121331211 is a deficient number, since it is larger than the sum of its proper divisors (937189).

2121331211 is an equidigital number, since it uses as much as digits as its factorization.

2121331211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 937188.

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

The square root of 2121331211 is about 46057.9114919467. The cubic root of 2121331211 is about 1284.9004875827.

Adding to 2121331211 its reverse (1121331212), we get a palindrome (3242662423).

Subtracting from 2121331211 its reverse (1121331212), we obtain a palindrome (999999999).

The spelling of 2121331211 in words is "two billion, one hundred twenty-one million, three hundred thirty-one thousand, two hundred eleven".