12212115211 has 4 divisors (see below), whose sum is σ = 12212349912. Its totient is φ = 12211880512.

The previous prime is 12212115173. The next prime is 12212115217. The reversal of 12212115211 is 11251121221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12212115211 - 2⁹ = 12212114699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12212115217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 550 + ... + 156283.

It is an arithmetic number, because the mean of its divisors is an integer number (3053087478).

Almost surely, 2^12212115211 is an apocalyptic number.

12212115211 is a deficient number, since it is larger than the sum of its proper divisors (234701).

12212115211 is an equidigital number, since it uses as much as digits as its factorization.

12212115211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234700.

The product of its digits is 80, while the sum is 19.

Adding to 12212115211 its reverse (11251121221), we get a palindrome (23463236432).

The spelling of 12212115211 in words is "twelve billion, two hundred twelve million, one hundred fifteen thousand, two hundred eleven".