121201221218 has 16 divisors (see below), whose sum is σ = 226662024384. Its totient is φ = 47221254960.

The previous prime is 121201221157. The next prime is 121201221221. The reversal of 121201221218 is 812122102121.

It is a junction number, because it is equal to n+sod(n) for n = 121201221193 and 121201221202.

It is an unprimeable number.

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, 393510305 + ... + 393510612.

It is an arithmetic number, because the mean of its divisors is an integer number (14166376524).

Almost surely, 2^121201221218 is an apocalyptic number.

121201221218 is a deficient number, since it is larger than the sum of its proper divisors (105460803166).

121201221218 is a wasteful number, since it uses less digits than its factorization.

121201221218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787020937.

The product of its (nonzero) digits is 256, while the sum is 23.

Adding to 121201221218 its reverse (812122102121), we get a palindrome (933323323339).

The spelling of 121201221218 in words is "one hundred twenty-one billion, two hundred one million, two hundred twenty-one thousand, two hundred eighteen".