12111212220121 has 48 divisors (see below), whose sum is σ = 14359403520000. Its totient is φ = 10183230858528.

The previous prime is 12111212220059. The next prime is 12111212220161. The reversal of 12111212220121 is 12102221211121.

It is a happy number.

It is not a de Polignac number, because 12111212220121 - 2⁹ = 12111212219609 is a prime.

It is a super-2 number, since 2×12111212220121² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12111212220161) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1938721420 + ... + 1938727666.

It is an arithmetic number, because the mean of its divisors is an integer number (299154240000).

Almost surely, 2^{12111212220121} is an apocalyptic number.

It is an amenable number.

12111212220121 is a deficient number, since it is larger than the sum of its proper divisors (2248191299879).

12111212220121 is a wasteful number, since it uses less digits than its factorization.

12111212220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9506 (or 9499 counting only the distinct ones).

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

Adding to 12111212220121 its reverse (12102221211121), we get a palindrome (24213433431242).

The spelling of 12111212220121 in words is "twelve trillion, one hundred eleven billion, two hundred twelve million, two hundred twenty thousand, one hundred twenty-one".