121212211211 has 48 divisors (see below), whose sum is σ = 151239398400. Its totient is φ = 95117742720.

The previous prime is 121212211187. The next prime is 121212211213. The reversal of 121212211211 is 112112212121.

It is not a de Polignac number, because 121212211211 - 2⁶ = 121212211147 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121212211211.

It is not an unprimeable number, because it can be changed into a prime (121212211213) 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 47 ways as a sum of consecutive naturals, for example, 99109946 + ... + 99111168.

It is an arithmetic number, because the mean of its divisors is an integer number (3150820800).

Almost surely, 2^121212211211 is an apocalyptic number.

121212211211 is a deficient number, since it is larger than the sum of its proper divisors (30027187189).

121212211211 is a wasteful number, since it uses less digits than its factorization.

121212211211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1876 (or 1863 counting only the distinct ones).

The product of its digits is 32, while the sum is 17.

Adding to 121212211211 its reverse (112112212121), we get a palindrome (233324423332).

The spelling of 121212211211 in words is "one hundred twenty-one billion, two hundred twelve million, two hundred eleven thousand, two hundred eleven".