12111100211221 has 8 divisors (see below), whose sum is σ = 13212159279264. Its totient is φ = 11010049469520.

The previous prime is 12111100211213. The next prime is 12111100211267. The reversal of 12111100211221 is 12211200111121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12111100211221 - 2³ = 12111100211213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12111100211195 and 12111100211204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111100211201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1182270 + ... + 5061616.

It is an arithmetic number, because the mean of its divisors is an integer number (1651519909908).

Almost surely, 2^{12111100211221} is an apocalyptic number.

12111100211221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12111100211221 is a deficient number, since it is larger than the sum of its proper divisors (1101059068043).

12111100211221 is a wasteful number, since it uses less digits than its factorization.

12111100211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4163171.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 12111100211221 its reverse (12211200111121), we get a palindrome (24322300322342).

It can be divided in two parts, 12111100 and 211221, that added together give a palindrome (12322321).

The spelling of 12111100211221 in words is "twelve trillion, one hundred eleven billion, one hundred million, two hundred eleven thousand, two hundred twenty-one".