121212112212211 has 4 divisors (see below), whose sum is σ = 121212557647552. Its totient is φ = 121211666776872.

The previous prime is 121212112212167. The next prime is 121212112212223. The reversal of 121212112212211 is 112212211212121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121212112212211 is a prime.

It is a super-2 number, since 2×121212112212211² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121212112212241) 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, 222309240 + ... + 222853813.

It is an arithmetic number, because the mean of its divisors is an integer number (30303139411888).

Almost surely, 2^{121212112212211} is an apocalyptic number.

121212112212211 is a deficient number, since it is larger than the sum of its proper divisors (445435341).

121212112212211 is an equidigital number, since it uses as much as digits as its factorization.

121212112212211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445435340.

The product of its digits is 128, while the sum is 22.

Adding to 121212112212211 its reverse (112212211212121), we get a palindrome (233424323424332).

The spelling of 121212112212211 in words is "one hundred twenty-one trillion, two hundred twelve billion, one hundred twelve million, two hundred twelve thousand, two hundred eleven".