12113223221 has 4 divisors (see below), whose sum is σ = 13214425344. Its totient is φ = 11012021100.

The previous prime is 12113223211. The next prime is 12113223223. The reversal of 12113223221 is 12232231121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12232231121 = 11 ⋅1112021011.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12113223221 is a prime.

It is a super-2 number, since 2×12113223221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12113223193 and 12113223202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12113223223) 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, 550601045 + ... + 550601066.

It is an arithmetic number, because the mean of its divisors is an integer number (3303606336).

Almost surely, 2^12113223221 is an apocalyptic number.

12113223221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12113223221 is a deficient number, since it is larger than the sum of its proper divisors (1101202123).

12113223221 is a wasteful number, since it uses less digits than its factorization.

12113223221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101202122.

The product of its digits is 288, while the sum is 20.

Adding to 12113223221 its reverse (12232231121), we get a palindrome (24345454342).

The spelling of 12113223221 in words is "twelve billion, one hundred thirteen million, two hundred twenty-three thousand, two hundred twenty-one".