23311212211 has 4 divisors (see below), whose sum is σ = 26641385392. Its totient is φ = 19981039032.

The previous prime is 23311212173. The next prime is 23311212227. The reversal of 23311212211 is 11221211332.

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 23311212211 - 2²³ = 23302823603 is a prime.

It is a super-2 number, since 2×23311212211² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23311216211) 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, 1665086580 + ... + 1665086593.

It is an arithmetic number, because the mean of its divisors is an integer number (6660346348).

Almost surely, 2^23311212211 is an apocalyptic number.

23311212211 is a deficient number, since it is larger than the sum of its proper divisors (3330173181).

23311212211 is an equidigital number, since it uses as much as digits as its factorization.

23311212211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3330173180.

The product of its digits is 144, while the sum is 19.

Adding to 23311212211 its reverse (11221211332), we get a palindrome (34532423543).

It can be divided in two parts, 2331121 and 2211, that added together give a palindrome (2333332).

The spelling of 23311212211 in words is "twenty-three billion, three hundred eleven million, two hundred twelve thousand, two hundred eleven".