12101112211121 has 4 divisors (see below), whose sum is σ = 12627247524672. Its totient is φ = 11574976897572.

The previous prime is 12101112211007. The next prime is 12101112211157. The reversal of 12101112211121 is 12111221110121.

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 12101112211121 - 2²² = 12101108016817 is a prime.

It is a super-2 number, since 2×12101112211121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12101112211121.

It is not an unprimeable number, because it can be changed into a prime (12101112213121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 263067656741 + ... + 263067656786.

It is an arithmetic number, because the mean of its divisors is an integer number (3156811881168).

Almost surely, 2^{12101112211121} is an apocalyptic number.

It is an amenable number.

12101112211121 is a deficient number, since it is larger than the sum of its proper divisors (526135313551).

12101112211121 is an equidigital number, since it uses as much as digits as its factorization.

12101112211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526135313550.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 12101112211121 its reverse (12111221110121), we get a palindrome (24212333321242).

The spelling of 12101112211121 in words is "twelve trillion, one hundred one billion, one hundred twelve million, two hundred eleven thousand, one hundred twenty-one".