121211121211 has 16 divisors (see below), whose sum is σ = 124788014208. Its totient is φ = 117683280000.

The previous prime is 121211121203. The next prime is 121211121223. The reversal of 121211121211 is 112121112121.

It is a cyclic number.

It is not a de Polignac number, because 121211121211 - 2³ = 121211121203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121211121011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12237361 + ... + 12247261.

It is an arithmetic number, because the mean of its divisors is an integer number (7799250888).

Almost surely, 2^121211121211 is an apocalyptic number.

121211121211 is a deficient number, since it is larger than the sum of its proper divisors (3576892997).

121211121211 is a wasteful number, since it uses less digits than its factorization.

121211121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12342.

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

Adding to 121211121211 its reverse (112121112121), we get a palindrome (233332233332).

The spelling of 121211121211 in words is "one hundred twenty-one billion, two hundred eleven million, one hundred twenty-one thousand, two hundred eleven".