12211112321 has 4 divisors (see below), whose sum is σ = 12742030272. Its totient is φ = 11680194372.

The previous prime is 12211112297. The next prime is 12211112327. The reversal of 12211112321 is 12321111221.

It is a happy number.

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: 12321111221 = 227 ⋅54278023.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12211112321 is a prime.

It is a super-2 number, since 2×12211112321² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12211112321.

It is not an unprimeable number, because it can be changed into a prime (12211112327) 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, 265458941 + ... + 265458986.

It is an arithmetic number, because the mean of its divisors is an integer number (3185507568).

Almost surely, 2^12211112321 is an apocalyptic number.

It is an amenable number.

12211112321 is a deficient number, since it is larger than the sum of its proper divisors (530917951).

12211112321 is an equidigital number, since it uses as much as digits as its factorization.

12211112321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530917950.

The product of its digits is 48, while the sum is 17.

Adding to 12211112321 its reverse (12321111221), we get a palindrome (24532223542).

It can be divided in two parts, 12211 and 112321, that multiplied together give a palindrome (1371551731).

The spelling of 12211112321 in words is "twelve billion, two hundred eleven million, one hundred twelve thousand, three hundred twenty-one".