12111555566121 has 32 divisors (see below), whose sum is σ = 17711761262976. Its totient is φ = 7300796160000.

The previous prime is 12111555566113. The next prime is 12111555566141. The reversal of 12111555566121 is 12166555511121.

It is not a de Polignac number, because 12111555566121 - 2³ = 12111555566113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12111555566141) 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 31 ways as a sum of consecutive naturals, for example, 20650521 + ... + 21228921.

It is an arithmetic number, because the mean of its divisors is an integer number (553492539468).

Almost surely, 2^{12111555566121} is an apocalyptic number.

12111555566121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12111555566121 is a deficient number, since it is larger than the sum of its proper divisors (5600205696855).

12111555566121 is a wasteful number, since it uses less digits than its factorization.

12111555566121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581833.

The product of its digits is 90000, while the sum is 42.

The spelling of 12111555566121 in words is "twelve trillion, one hundred eleven billion, five hundred fifty-five million, five hundred sixty-six thousand, one hundred twenty-one".