12121121110211 has 12 divisors (see below), whose sum is σ = 12546075492216. Its totient is φ = 11710133494560.

The previous prime is 12121121110207. The next prime is 12121121110213. The reversal of 12121121110211 is 11201112112121.

It is not a de Polignac number, because 12121121110211 - 2² = 12121121110207 is a prime.

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 12121121110211.

It is not an unprimeable number, because it can be changed into a prime (12121121110213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10179530 + ... + 11307743.

It is an arithmetic number, because the mean of its divisors is an integer number (1045506291018).

Almost surely, 2^{12121121110211} is an apocalyptic number.

12121121110211 is a deficient number, since it is larger than the sum of its proper divisors (424954382005).

12121121110211 is an equidigital number, since it uses as much as digits as its factorization.

12121121110211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21487922 (or 21487891 counting only the distinct ones).

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

Adding to 12121121110211 its reverse (11201112112121), we get a palindrome (23322233222332).

The spelling of 12121121110211 in words is "twelve trillion, one hundred twenty-one billion, one hundred twenty-one million, one hundred ten thousand, two hundred eleven".