12121021211 has 12 divisors (see below), whose sum is σ = 13255099920. Its totient is φ = 11077840800.

The previous prime is 12121021201. The next prime is 12121021261. The reversal of 12121021211 is 11212012121.

12121021211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12121021211 - 2¹⁸ = 12120759067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12121021201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 337991 + ... + 372128.

It is an arithmetic number, because the mean of its divisors is an integer number (1104591660).

Almost surely, 2^12121021211 is an apocalyptic number.

12121021211 is a deficient number, since it is larger than the sum of its proper divisors (1134078709).

12121021211 is a wasteful number, since it uses less digits than its factorization.

12121021211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710246 (or 710233 counting only the distinct ones).

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

Adding to 12121021211 its reverse (11212012121), we get a palindrome (23333033332).

The spelling of 12121021211 in words is "twelve billion, one hundred twenty-one million, twenty-one thousand, two hundred eleven".