12111211010121 has 4 divisors (see below), whose sum is σ = 16148281346832. Its totient is φ = 8074140673412.

The previous prime is 12111211010083. The next prime is 12111211010153. The reversal of 12111211010121 is 12101011211121.

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 12111211010121 - 2⁷ = 12111211009993 is a prime.

It is a super-2 number, since 2×12111211010121² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12111211010121.

It is not an unprimeable number, because it can be changed into a prime (12111211010191) 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, 2018535168351 + ... + 2018535168356.

It is an arithmetic number, because the mean of its divisors is an integer number (4037070336708).

Almost surely, 2^{12111211010121} is an apocalyptic number.

It is an amenable number.

12111211010121 is a deficient number, since it is larger than the sum of its proper divisors (4037070336711).

12111211010121 is an equidigital number, since it uses as much as digits as its factorization.

12111211010121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4037070336710.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 12111211010121 its reverse (12101011211121), we get a palindrome (24212222221242).

The spelling of 12111211010121 in words is "twelve trillion, one hundred eleven billion, two hundred eleven million, ten thousand, one hundred twenty-one".