12111010112221 has 4 divisors (see below), whose sum is σ = 12111313056192. Its totient is φ = 12110707168252.

The previous prime is 12111010112189. The next prime is 12111010112233. The reversal of 12111010112221 is 12221101011121.

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.

It is a cyclic number.

It is not a de Polignac number, because 12111010112221 - 2⁵ = 12111010112189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12111010112195 and 12111010112204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111010112021) 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, 151412011 + ... + 151491976.

It is an arithmetic number, because the mean of its divisors is an integer number (3027828264048).

Almost surely, 2^{12111010112221} is an apocalyptic number.

It is an amenable number.

12111010112221 is a deficient number, since it is larger than the sum of its proper divisors (302943971).

12111010112221 is an equidigital number, since it uses as much as digits as its factorization.

12111010112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302943970.

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

Adding to 12111010112221 its reverse (12221101011121), we get a palindrome (24332111123342).

The spelling of 12111010112221 in words is "twelve trillion, one hundred eleven billion, ten million, one hundred twelve thousand, two hundred twenty-one".