12011112222121 has 4 divisors (see below), whose sum is σ = 12533334492672. Its totient is φ = 11488889951572.

The previous prime is 12011112222113. The next prime is 12011112222149. The reversal of 12011112222121 is 12122221111021.

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.

It is a cyclic number.

It is not a de Polignac number, because 12011112222121 - 2³ = 12011112222113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12011112222521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 261111135241 + ... + 261111135286.

It is an arithmetic number, because the mean of its divisors is an integer number (3133333623168).

Almost surely, 2^{12011112222121} is an apocalyptic number.

It is an amenable number.

12011112222121 is a deficient number, since it is larger than the sum of its proper divisors (522222270551).

12011112222121 is an equidigital number, since it uses as much as digits as its factorization.

12011112222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522222270550.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 12011112222121 its reverse (12122221111021), we get a palindrome (24133333333142).

Subtracting 12011112222121 from its reverse (12122221111021), we obtain a square (111108888900 = 333330²).

The spelling of 12011112222121 in words is "twelve trillion, eleven billion, one hundred twelve million, two hundred twenty-two thousand, one hundred twenty-one".