2121123221311 has 4 divisors (see below), whose sum is σ = 2121141566800. Its totient is φ = 2121104875824.

The previous prime is 2121123221297. The next prime is 2121123221323. The reversal of 2121123221311 is 1131223211212.

It is a happy number.

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 2121123221311 - 2⁵ = 2121123221279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121123221611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8998206 + ... + 9230923.

It is an arithmetic number, because the mean of its divisors is an integer number (530285391700).

Almost surely, 2^{2121123221311} is an apocalyptic number.

2121123221311 is a deficient number, since it is larger than the sum of its proper divisors (18345489).

2121123221311 is a wasteful number, since it uses less digits than its factorization.

2121123221311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18345488.

The product of its digits is 288, while the sum is 22.

Adding to 2121123221311 its reverse (1131223211212), we get a palindrome (3252346432523).

The spelling of 2121123221311 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-three million, two hundred twenty-one thousand, three hundred eleven".