12120121211 has 12 divisors (see below), whose sum is σ = 13329204672. Its totient is φ = 11012430000.

The previous prime is 12120121207. The next prime is 12120121259. The reversal of 12120121211 is 11212102121.

It is not a de Polignac number, because 12120121211 - 2² = 12120121207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12120121201) 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, 210401 + ... + 261741.

It is an arithmetic number, because the mean of its divisors is an integer number (1110767056).

Almost surely, 2^12120121211 is an apocalyptic number.

12120121211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12120121211 is a deficient number, since it is larger than the sum of its proper divisors (1209083461).

12120121211 is a wasteful number, since it uses less digits than its factorization.

12120121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53314 (or 53303 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 12120121211 its reverse (11212102121), we get a palindrome (23332223332).

It can be divided in two parts, 12120 and 121211, that added together give a palindrome (133331).

The spelling of 12120121211 in words is "twelve billion, one hundred twenty million, one hundred twenty-one thousand, two hundred eleven".