12111212012221 has 8 divisors (see below), whose sum is σ = 14655584283840. Its totient is φ = 9770389522368.

The previous prime is 12111212012213. The next prime is 12111212012257. The reversal of 12111212012221 is 12221021211121.

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 12111212012221 - 2³ = 12111212012213 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 (12111212012821) 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, 50887445311 + ... + 50887445548.

It is an arithmetic number, because the mean of its divisors is an integer number (1831948035480).

Almost surely, 2^{12111212012221} is an apocalyptic number.

It is an amenable number.

12111212012221 is a deficient number, since it is larger than the sum of its proper divisors (2544372271619).

12111212012221 is a wasteful number, since it uses less digits than its factorization.

12111212012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101774890883.

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

Adding to 12111212012221 its reverse (12221021211121), we get a palindrome (24332233223342).

The spelling of 12111212012221 in words is "twelve trillion, one hundred eleven billion, two hundred twelve million, twelve thousand, two hundred twenty-one".