12212121211 has 4 divisors (see below), whose sum is σ = 12274111872. Its totient is φ = 12150130552.

The previous prime is 12212121179. The next prime is 12212121263. The reversal of 12212121211 is 11212121221.

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 12212121211 - 2⁵ = 12212121179 is a prime.

It is a super-2 number, since 2×12212121211² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12212121011) 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, 30995035 + ... + 30995428.

It is an arithmetic number, because the mean of its divisors is an integer number (3068527968).

Almost surely, 2^12212121211 is an apocalyptic number.

12212121211 is a deficient number, since it is larger than the sum of its proper divisors (61990661).

12212121211 is an equidigital number, since it uses as much as digits as its factorization.

12212121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61990660.

The product of its digits is 32, while the sum is 16.

Adding to 12212121211 its reverse (11212121221), we get a palindrome (23424242432).

The spelling of 12212121211 in words is "twelve billion, two hundred twelve million, one hundred twenty-one thousand, two hundred eleven".