2121311 has 4 divisors (see below), whose sum is σ = 2246112. Its totient is φ = 1996512.

The previous prime is 2121289. The next prime is 2121323. The reversal of 2121311 is 1131212.

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 2121311 - 2¹⁸ = 1859167 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121292 and 2121301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121341) 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, 62375 + ... + 62408.

It is an arithmetic number, because the mean of its divisors is an integer number (561528).

2^2121311 is an apocalyptic number.

2121311 is a deficient number, since it is larger than the sum of its proper divisors (124801).

2121311 is a wasteful number, since it uses less digits than its factorization.

2121311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124800.

The product of its digits is 12, while the sum is 11.

The square root of 2121311 is about 1456.4721075256. The cubic root of 2121311 is about 128.4896406936.

Adding to 2121311 its reverse (1131212), we get a palindrome (3252523).

Subtracting from 2121311 its reverse (1131212), we obtain a palindrome (990099).

The spelling of 2121311 in words is "two million, one hundred twenty-one thousand, three hundred eleven".