12212231111 has 4 divisors (see below), whose sum is σ = 12240435312. Its totient is φ = 12184026912.

The previous prime is 12212231081. The next prime is 12212231131. The reversal of 12212231111 is 11113221221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12212231111 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12212231111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212231131) 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, 14101451 + ... + 14102316.

It is an arithmetic number, because the mean of its divisors is an integer number (3060108828).

Almost surely, 2^12212231111 is an apocalyptic number.

12212231111 is a deficient number, since it is larger than the sum of its proper divisors (28204201).

12212231111 is an equidigital number, since it uses as much as digits as its factorization.

12212231111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28204200.

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

Adding to 12212231111 its reverse (11113221221), we get a palindrome (23325452332).

The spelling of 12212231111 in words is "twelve billion, two hundred twelve million, two hundred thirty-one thousand, one hundred eleven".