121211111208 has 32 divisors (see below), whose sum is σ = 330575758560. Its totient is φ = 36730639680.

The previous prime is 121211111201. The next prime is 121211111227. The reversal of 121211111208 is 802111112121.

It is not an unprimeable number, because it can be changed into a prime (121211111201) 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 7 ways as a sum of consecutive naturals, for example, 229566235 + ... + 229566762.

It is an arithmetic number, because the mean of its divisors is an integer number (10330492455).

Almost surely, 2^121211111208 is an apocalyptic number.

It is an amenable number.

121211111208 is an abundant number, since it is smaller than the sum of its proper divisors (209364647352).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121211111208 is a wasteful number, since it uses less digits than its factorization.

121211111208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459133017 (or 459133013 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 21.

Adding to 121211111208 its reverse (802111112121), we get a palindrome (923322223329).

The spelling of 121211111208 in words is "one hundred twenty-one billion, two hundred eleven million, one hundred eleven thousand, two hundred eight".