2123221312211 has 4 divisors (see below), whose sum is σ = 2124565975800. Its totient is φ = 2121876648624.

The previous prime is 2123221312189. The next prime is 2123221312213. The reversal of 2123221312211 is 1122131223212.

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 2123221312211 - 2²⁶ = 2123154203347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2123221312213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 672329426 + ... + 672332583.

It is an arithmetic number, because the mean of its divisors is an integer number (531141493950).

Almost surely, 2^{2123221312211} is an apocalyptic number.

2123221312211 is a deficient number, since it is larger than the sum of its proper divisors (1344663589).

2123221312211 is a wasteful number, since it uses less digits than its factorization.

2123221312211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1344663588.

The product of its digits is 576, while the sum is 23.

Adding to 2123221312211 its reverse (1122131223212), we get a palindrome (3245352535423).

It can be divided in two parts, 21 and 23221312211, that added together give a palindrome (23221312232).

The spelling of 2123221312211 in words is "two trillion, one hundred twenty-three billion, two hundred twenty-one million, three hundred twelve thousand, two hundred eleven".