2123311 has 4 divisors (see below), whose sum is σ = 2135224. Its totient is φ = 2111400.

The previous prime is 2123309. The next prime is 2123327. The reversal of 2123311 is 1133212.

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 2123311 - 2¹ = 2123309 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2123291 and 2123300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123411) 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, 5685 + ... + 6046.

It is an arithmetic number, because the mean of its divisors is an integer number (533806).

2^2123311 is an apocalyptic number.

2123311 is a deficient number, since it is larger than the sum of its proper divisors (11913).

2123311 is a wasteful number, since it uses less digits than its factorization.

2123311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11912.

The product of its digits is 36, while the sum is 13.

The square root of 2123311 is about 1457.1585363302. The cubic root of 2123311 is about 128.5300085860.

Adding to 2123311 its reverse (1133212), we get a palindrome (3256523).

Subtracting from 2123311 its reverse (1133212), we obtain a palindrome (990099).

It can be divided in two parts, 21 and 23311, that added together give a palindrome (23332).

The spelling of 2123311 in words is "two million, one hundred twenty-three thousand, three hundred eleven".