12111212120221 has 8 divisors (see below), whose sum is σ = 12132492229440. Its totient is φ = 12089950383168.

The previous prime is 12111212120197. The next prime is 12111212120237. The reversal of 12111212120221 is 12202121211121.

It is a happy number.

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 12111212120221 - 2¹⁹ = 12111211595933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111212120291) 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 7 ways as a sum of consecutive naturals, for example, 3273121 + ... + 5910646.

It is an arithmetic number, because the mean of its divisors is an integer number (1516561528680).

Almost surely, 2^{12111212120221} is an apocalyptic number.

It is an amenable number.

12111212120221 is a deficient number, since it is larger than the sum of its proper divisors (21280109219).

12111212120221 is a wasteful number, since it uses less digits than its factorization.

12111212120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9186083.

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

Adding to 12111212120221 its reverse (12202121211121), we get a palindrome (24313333331342).

The spelling of 12111212120221 in words is "twelve trillion, one hundred eleven billion, two hundred twelve million, one hundred twenty thousand, two hundred twenty-one".