12123223011 has 48 divisors (see below), whose sum is σ = 18717073440. Its totient is φ = 7539609600.

The previous prime is 12123222989. The next prime is 12123223027. The reversal of 12123223011 is 11032232121.

It is a de Polignac number, because none of the positive numbers 2^k-12123223011 is a prime.

It is a super-2 number, since 2×12123223011² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12123223031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3331485 + ... + 3335121.

It is an arithmetic number, because the mean of its divisors is an integer number (389939030).

Almost surely, 2^12123223011 is an apocalyptic number.

12123223011 is a deficient number, since it is larger than the sum of its proper divisors (6593850429).

12123223011 is a wasteful number, since it uses less digits than its factorization.

12123223011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3956 (or 3953 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 12123223011 its reverse (11032232121), we get a palindrome (23155455132).

It can be divided in two parts, 1212 and 3223011, that added together give a palindrome (3224223).

The spelling of 12123223011 in words is "twelve billion, one hundred twenty-three million, two hundred twenty-three thousand, eleven".