2123311211 has 4 divisors (see below), whose sum is σ = 2426641392. Its totient is φ = 1819981032.

The previous prime is 2123311189. The next prime is 2123311219. The reversal of 2123311211 is 1121133212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2123311211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2123311211.

It is not an unprimeable number, because it can be changed into a prime (2123311219) 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, 151665080 + ... + 151665093.

It is an arithmetic number, because the mean of its divisors is an integer number (606660348).

Almost surely, 2^2123311211 is an apocalyptic number.

2123311211 is a deficient number, since it is larger than the sum of its proper divisors (303330181).

2123311211 is an equidigital number, since it uses as much as digits as its factorization.

2123311211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303330180.

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

The square root of 2123311211 is about 46079.4011571331. The cubic root of 2123311211 is about 1285.3001284351.

Adding to 2123311211 its reverse (1121133212), we get a palindrome (3244444423).

The spelling of 2123311211 in words is "two billion, one hundred twenty-three million, three hundred eleven thousand, two hundred eleven".